Re: [Sipping] Summary of Closing the offer/answer rollback issue?

[Gonzalo Camarillo <[e-mail]>]

Hi Hadriel,

as I stated in one of the emails in that thread, I will be summarizing 
the whole thread as soon as I have a minute. I do not expect folks to 
read and follow the whole thread :o)

Cheers,

Gonzalo

Hadriel Kaplan wrote:
> Is there an email in this long thread that summarizes the issues?
> It's impossible to follow this thread. :)
> 
> I'm not clear on what the issues are with pre-conditions that make failed offers concept break.  To me, pre-conditions are basically not real SDP offers; they're conditional offers.  Until the *all* the conditions are met, it's not "committed".  You continue using the last committed state.  I know there are race conditions, but considering how rare pre-conditions are in the real world (especially in re-Invite's), that I'm having trouble imagining why we should care about corner cases of such.  Regardless, I vote for any fixing that needs to happen because of pre-conditions should be around changing pre-condition logic, even if it means completely re-writing how pre-conditions works - don't change normal SIP or SDP. (not that anyone is proposing it, I just can't tell form this thread)
> 
> Re-Invites and SDP offer/answer have so many interop issues in the wild even without pre-conditions, that this whole thread scares me. :(
> 
> -hadriel
> 


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Date: Tue, 03 Feb 2009 20:13:01 +0000
From: "Elwell, John" <[e-mail]>
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Subject: Re: [Sipping] Commentsondraft-loreto-sipping-context-id-requirements-00
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Sal,

It should be possible to express requirements without referring to
dialogs. Any reference to dialogs seems to make some assumption about
solution.

John

> -----Original Message-----
> From: [e-mail]=20
> [mailto:[e-mail]] On Behalf Of Salvatore Loreto
> Sent: 03 February 2009 20:03
> To: Paul Kyzivat
> Cc: SIPPING; Elwell, John
> Subject: Re: [Sipping]=20
> Commentsondraft-loreto-sipping-context-id-requirements-00
>=20
> <snip>
> >>> Req A:  It must be possible, when establishing a dialog,=20
> to specify=20
> >>> that
> >>> it be correlated with one or more already existing dialogs, which
> >>> dialogs, at the time they were created, did not need to=20
> specify that
> >>> they might be correlated with in the future.
> >> [JRE] I don't think this is a valid requirement, because it has a
> >> particular class of solutions in mind. In my opinion the basic
> >> requirement should be something along the lines of "It=20
> must be possible
> >> to establish, modify and clear down a multimedia session=20
> between two
> >> parties, one or both of which use different devices for different
> >> media."
> >>
> >> John
> >
> > I agree with John.
> >
> >     Paul
> I agree on the fact that the requirements have to be as=20
> general as possible.
> In fact if you read my mail "Correlate sip sessions/dialogs"=20
> you can see
> we have already have two requirements that are similar=20
> (almost equal) to=20
> the one suggested by John.
>=20
> The requirement in this mail was about the possibility to create the=20
> initial dialog without knowing
> in advance whether another dialog will want to correlate with it.
> We can generalize it:
>=20
> "It must be possible to create a dialog without knowing in advance=20
> whether or not
> another dialog will want to correlate with it"
>=20
> Maybe it is a redundant  requirement  but at this stage there are =20
> people that think it should be specified.
>=20
> Sal
> _______________________________________________
> Sipping mailing list  https://www.ietf.org/mailman/listinfo/sipping
> This list is for NEW development of the application of SIP
> Use [e-mail] for questions on current sip
> Use [e-mail] for new developments of core SIP
>=20


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Subject: [Sipping] Comments on draft-niemi-sipping-event-throttle-07.txt
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--000e0cd29a5214208904620d908d
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- Section 3 talks about presence, location and tracking applications. I was
confused reading those sections the first time thinking the presence
application sits on the server. Can you replace the word "application" with
"client"? As a suggestion, I would say the whoel document needs to be
updated with this suggestion

- Section 3.2 talks about filters. A reference is needed to filters RFC.
Also, more text is needed around how this Force extention overrides a filter
criteria and why would someone set a filter only to override it with a
Force.

- Figure 1 needs to be modified to show how filters are affected

- Section 4.3: Need to expand on how the client can reject the notifier's
adjusted intervals?

- I think its a good idea to talk about how a notifier can suggest to the
client the throttling mechanism and throttle interval without the client
asking for it. At least the draft can talk about how if a notifier has a
policy to limit notifications according to admin throttling settings, those
can/cannot be applied without the client requesting them. That's something
that we need to decide, although it is difficult to mandate that a notifier
cannot apply throttles unless it is asked to do so.

- "average" I dont understand what that is? is it the average interval
between notifications sent so far? How is that value decided? is average the
wrong word to use here. More explanation is needed.

Regards,
Hisham

--000e0cd29a5214208904620d908d
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<div>- Section 3 talks about presence, location and tracking applications. =
I was confused reading those sections the first time thinking the presence =
application sits on the server. Can you replace the word &quot;application&=
quot; with &quot;client&quot;? As a suggestion, I would say the whoel docum=
ent needs to be updated with this suggestion</div>

<div>&nbsp;</div>
<div>- Section 3.2 talks about filters. A reference is needed to filters RF=
C. Also, more text is needed around how this Force extention overrides a fi=
lter criteria and why would someone set a filter only to override it with a=
 Force.</div>

<div>&nbsp;</div>
<div>- Figure 1 needs to be modified to show how filters are affected</div>
<div>&nbsp;</div>
<div>- Section 4.3: Need to expand on how the client can reject the notifie=
r&#39;s adjusted intervals?</div>
<div>&nbsp;</div>
<div>- I think its a good idea to talk about how a notifier can suggest to =
the client the throttling mechanism and throttle interval without the clien=
t asking for it. At least the draft can talk about how if a notifier has a =
policy to limit notifications according to admin&nbsp;throttling settings, =
those can/cannot be applied without the client requesting them. That&#39;s =
something that we need to decide, although it is difficult to mandate that =
a notifier cannot apply throttles unless it is asked to do so.</div>

<div>&nbsp;</div>
<div>- &quot;average&quot; I dont understand what that is? is it the averag=
e interval between notifications sent so far? How is that value decided? is=
 average the wrong word to use here. More explanation is needed.</div>

<div>&nbsp;</div>
<div>Regards,</div>
<div>Hisham</div>

--000e0cd29a5214208904620d908d--


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Hi Sal,

Here my opinion on your proposals. =20

	>=20
	> My proposal here is to keep, in the merged document, distinct=20
	> this two=20
	> requirements as they seems to be semantically different.
	> I propose to have a set of requirements for "media session=20
	> correlation"=20
	> and a set of requirements for "dialog correlation".
	> Please comment!

I  agree with your proposal. I suppose using the same identifier for
both "media session=20
 correlation"  and "dialog correlation" could lead to failures. =20

	>=20
	>=20
	> One second issue, that it is IMO common, is to discuss and
decide=20
	> whether we can create the initial dialog without knowing
	> in advance whether another dialog will want to correlate with=20
	> it (as I=20
	> think we should)//
	>=20
	>     Req A: It must be possible, when establishing a dialog,=20
	> to specify that
	>     it be correlated with one or more already existing
dialogs, which
	>     dialogs, at the time they were created, did not need to=20
	> specify that
	>     they might be correlated with in the future.

I agreee. We have to consider older end devices which will not support
the new extension.=20
It must be possible to correlate dialogs with dialogs already
established by these older devices.=20
It is a necessary requirement at least for "dialog correlation", but I
think it make sense as a common requirement.=20
It would add flexibility to the mechanism.=20
 =20
>=20
>=20
	> Please comment, if you think this requirement can be
considered in=20
	> common or not.
	>=20
	> then draft [3] there is a requirement related to=20
	> out-of-dialog request,=20
	> that I don't know (I don't have a strong
	> opinion on it) if we can be consider in common or not:
	>=20
	>    REQ[3].2: It must be possible for a SIP device to use the=20
	> identifier in=20
	>    out-of-dialog requests, to match existing dialogs at=20
	> B2BUA's and/or=20
	>    UAS's, if the Call-ID and tags the device believes are
correct do=20
	>    not in fact match, with as high a probability as possible.=20

I don't have an opinion about this.=20


regards
laura


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Subject: Re: [Sipping] Commentsondraft-loreto-sipping-context-id-requirements-00
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John,

as you can read on the "Correlate sip sessions/dialogs" mail thread we 
are trying to merge in one draft
all the different requirements currently spread in three drafts.
In that draft we will have two separate set of requirements one for 
"media session correlation" and another
for "dialog correlation".
So it could be hard not to refer to dialogs at all.

However as I said we will do our best to make the requirement as general 
as possible


Sal

Elwell, John wrote:
> Sal,
>
> It should be possible to express requirements without referring to
> dialogs. Any reference to dialogs seems to make some assumption about
> solution.
>
> John
>
>   
>> -----Original Message-----
>> From: [e-mail] 
>> [mailto:[e-mail]] On Behalf Of Salvatore Loreto
>> Sent: 03 February 2009 20:03
>> To: Paul Kyzivat
>> Cc: SIPPING; Elwell, John
>> Subject: Re: [Sipping] 
>> Commentsondraft-loreto-sipping-context-id-requirements-00
>>
>> <snip>
>>     
>>>>> Req A:  It must be possible, when establishing a dialog, 
>>>>>           
>> to specify 
>>     
>>>>> that
>>>>> it be correlated with one or more already existing dialogs, which
>>>>> dialogs, at the time they were created, did not need to 
>>>>>           
>> specify that
>>     
>>>>> they might be correlated with in the future.
>>>>>           
>>>> [JRE] I don't think this is a valid requirement, because it has a
>>>> particular class of solutions in mind. In my opinion the basic
>>>> requirement should be something along the lines of "It 
>>>>         
>> must be possible
>>     
>>>> to establish, modify and clear down a multimedia session 
>>>>         
>> between two
>>     
>>>> parties, one or both of which use different devices for different
>>>> media."
>>>>
>>>> John
>>>>         
>>> I agree with John.
>>>
>>>     Paul
>>>       
>> I agree on the fact that the requirements have to be as 
>> general as possible.
>> In fact if you read my mail "Correlate sip sessions/dialogs" 
>> you can see
>> we have already have two requirements that are similar 
>> (almost equal) to 
>> the one suggested by John.
>>
>> The requirement in this mail was about the possibility to create the 
>> initial dialog without knowing
>> in advance whether another dialog will want to correlate with it.
>> We can generalize it:
>>
>> "It must be possible to create a dialog without knowing in advance 
>> whether or not
>> another dialog will want to correlate with it"
>>
>> Maybe it is a redundant  requirement  but at this stage there are  
>> people that think it should be specified.
>>
>> Sal
>> _______________________________________________
>> Sipping mailing list  https://www.ietf.org/mailman/listinfo/sipping
>> This list is for NEW development of the application of SIP
>> Use [e-mail] for questions on current sip
>> Use [e-mail] for new developments of core SIP
>>
>>     
>
>   



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Subject: Re: [Sipping] I-D Action:draft-gurbani-sipping-clf-00.txt
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A possibly stupid question: is there some reason why this couldn't/shouldn't
be done w/syslog?

> -----Original Message-----
> From: [e-mail] [mailto:i-d-announce-
> [e-mail]] On Behalf Of [e-mail]
> Sent: Tuesday, February 03, 2009 2:15 AM
> To: [e-mail]
> Subject: I-D Action:draft-gurbani-sipping-clf-00.txt
> 
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> 
> 	Title           : The Common Log File (CLF) format for the
> Session Initiation Protocol (SIP)
> 	Author(s)       : V. Gurbani, et al.
> 	Filename        : draft-gurbani-sipping-clf-00.txt
> 	Pages           : 17
> 	Date            : 2009-02-02
> 
> Well-known web servers such as Apache and web proxies like Squid
> support event logging using a common log format.  The logs produced
> using these de-facto standard formats are invaluable to system
> administrators for trouble-shooting a server and tool writers to craft
> tools that mine the log files and produce reports and trends.
> Furthermore, these log files can also be used to train anomaly
> detection systems and feed events into a security event management
> system.  The Session Initiation Protocol does not have a common log
> format, and as a result, each server supports a distinct log format
> that makes it unnecessarily complex to produce tools to do trend
> analysis and security detection.  We propose a common log file format
> for SIP servers that can be used uniformly for proxies, registrars,
> redirect servers as well as back-to-back user agents.
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-gurbani-sipping-clf-00.txt
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> Below is the data which will enable a MIME compliant mail reader
> implementation to automatically retrieve the ASCII version of the
> Internet-Draft.



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From: "Dale Worley" <[e-mail]>
To: "Vijay K. Gurbani" <[e-mail]>
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Cc: sipping <[e-mail]>
Subject: Re: [Sipping] SIP CLF Format
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On Mon, 2009-02-02 at 16:39 -0600, Vijay K. Gurbani wrote: 
> > - What exactly are the events that are logged?  E.g., section 4.1.2 
> > refers to a "method event", which is a phrase I've never heard 
> > before. Does it refer to SIP requests?
> 
> Ah, yes; another good catch.  Method event refers to SIP requests.
> I will make this more clear in a subsequent revision.

It would help if you replace "method" with "request" throughout, since
"method" seems to be normally used to refer to only the method specified
in a request, not the request as a whole.

> > In which case, does it mean the *reception* of a SIP request or the
> > *sending* of a SIP request? Or is the intention to log the
> > request/response pair as one line (as would make sense in an HTTP
> > server, but less sense in a SIP proxy that implements forking)?
> 
> For SIP proxies you cannot log the request/response pair in one
> line. That is where S4.2 comes in. The directives in S4.2
> allow the representation of a [request] arriving at a proxy as 
> well as departing from the proxy (or B2BUA).

That makes sense, but I don't see a statement up front saying "one CLF
line is generated upon the receipt of each SIP message (request or
response) and one CLF is generated upon the transmission of each SIP
message".  One has to deduce from various examples that these are the
events that generate CLF lines.

I am assuming here that all provisional responses (received and sent)
are to be logged.

But perhaps I am running up against a philosophical problem -- Is the
intention to log SIP *messages*, or to log *transactions*?  In the
former case, it's unambiguous what events generate log lines and what
the lines mean.  But in the latter case, much more care needs to be
taken to specify what is logged and when, as there isn't a one-to-one
correspondence between SIP events (transmission and receipt of messages)
and transactions.

I suspect the intention is that for UAS transactions, you want CLF to
log transactions (and thus always fold the transmitted response into the
received request), but that for UAC transactions, and the server/client
transactions of proxies/B2BUAs, you want to log each sent and received
message separately.

The idea of using one line to give both request and response data is
natural for an HTTP server, where both happen at nearly the same moment.
But in SIP, in at least half its actions, even a UA will be a client,
where the request and response may be separated by a substantial time.

> > - In regard to the remotehost (%h) field, does "upstream" mean (as it
> >  usually does) "the source if the request that initiated this 
> > processing"?  
> 
> Yes.
> 
> > In which case, there seems to be no place to identify 
> > the host/address to which an outgoing request is sent, or the 
> > host/address from which an incoming response is received (since that 
> > is a "downstream" host).
> 
> That is captured in S4.2.  The entity to which a request is
> sent downstream is identified by the R-URI (see top of page
> 13.)  I agree this is a bit hard to follow until you sit down
> and work it out, but that is the nature of the complexity.
> Any suggestions to make it less complex would be greatly
> welcome.

The entity to which a request is sent downstream is not reliably
identified by the R-URI, due to all the rules in RFC 3263.  (Consider an
element sending a request sequentially to several different resolutions
of the R-URI in attempt to find a server that is functioning.)  Given
our experience with sipX, I would strongly recommend that the triple
"transport/host IP address/port" be logged for all sent messages.
Otherwise CLF will be useless for diagnosing routing actions at the RFC
3263 level.

> > - Some care needs to be taken to describe how CANCEL and ACK are 
> > logged. (E.g., ACK for success and ACK for failure *might* be logged 
> > differently -- what is intended?)  This need is discussed in section 
> > 1, but I don't see clear prescriptions of what is to be done.
> 
> There is an example in S4.1.4; CANCEL is discussed in detail
> there.  Regarding ACK for 2xx and ACK for non-2xx, I believe
> that they ought to be logged similarly but the interpretation of
> them is different (i.e., the automata reading the CLF file will
> trigger different states based on whether or not the ACK is
> for a 2xx or non-2xx.)

I think you've got the right idea, but I would much prefer that clear
specifications be laid out in addition to the examples.

> > - Are the "..." around %c really necessary?  Or is that a legacy of 
> > the Apache format?  (And if so, does the Apache format allow %c to 
> > contain spaces?  How does that affect the identification of fields?)
> 
> Apache, of course, does not have a "%c"; it does, however, have
> a "%r", which represents the request line as it comes in from
> a browser.  The Apache CLF encloses this in a pair of braces
> since the "%r" represents three different tokens in Apache:
> the method (GET), the resource (/index.html) and the protocol
> version ("HTTP/1.0").
> 
> "%c" for SIP CLF was put in braces just to include any LWS (and
> I will probably have to look at this in more detail as the work
> moved ahead.)

(I assume you mean "quotes" there.)

Though it doesn't seem that %c can contain whitespace, since it is a
comma-separated list of URIs, or else is "-".  

I also notice that despite that %c is always enclosed in quotes, if
there are not contacts, %c is represented by a single hyphen, which
would appear as quote-hyphen-quote in a CLF line.  It would be more
uniform to turn "%c" to "", and the fields could still be parsed.  Even
better, eliminate the quotes entirely, and use hyphen if there are no
contacts.

But it doesn't look like %c is the contact URIs, but rather the contact
name-addrs, based on the second example in section 4.1.4.  In that case,
there is a lot more trouble, because a name-addr can contain a quote.

Consider the particularly ugly example:

Contact: <sip:[e-mail]>;param=" value1 value2 "

Embedded into the second example of section 4.1.4:

1230756560 192.168.1.2 alice REGISTER sip:example.com sip:[e-mail];tag=iu8u76 sip:[e-mail];tag=yh78 [e-mail] 200 "<sip:[e-mail]>;param=" value1 value2 "" serverid -

(I hope that comes through OK.)  A parser that looks for the end of the
quote-%c-quote field by looking for quote-space will stop after
";param=", and will take "value1" as the server transaction id and
"value2" as the client transaction id, whereas the real server
transaction id is "serverid".

> > - What are the extension mechanisms (other than additional fields at 
> > the ends of the two line formats)?  Is there any way to identify 
> > which software version generated a particular log file, so that the 
> > reader can unambiguously determine how to interpret the extension 
> > fields?
> 
> Excellent question.  There isn't a versioning system for the
> SIP CLF itself; however, the extension mechanism is rather
> simple: you can include any other field you want besides the
> fields that constitute the CLF.  We do not restrict this,
> subject to the discussion in S5 (Security Considerations.)
> Of course, what we want to standardize are the fields we
> have listed and in the order that we have listed them in.
> These constitute the canonical definition of a "SIP CLF".
> Implementations are free to add other fields as long as they
> provide/maintain updated SIP CLF parsers.

But there is no way for a CLF parser that supports extensions to
determine which extensions are present, other than heuristically.
Maybe that this is particularly important.  Perhaps we could require
that extensions start with a field formatted "token[" and end with a
field "]", so a parser could identify the start, end, and type of each
extension without specific knowledge of all extensions?

> > - Why is the to-URI (%t) present in the response format?  It's 
> > redundant with the same information in the corresponding request 
> > format.  And if we want such redundant information, why not provide 
> > %f as well?
> 
> There is a discussion of this in S4.1.3.  Should we embellish
> the discussion in there some more?

Given that %x and %y are present in response lines, and those identify
the other requests/responses in the transaction, and indirectly the
dialog, why is the to-tag (in %t) needed?

Looking at %x and %y, the server and client transaction identifiers, I
see six cases:

Line for message                %x                      %y

Incoming requests (server)      server trans id         -
or                              server trans id         FORK/-

Outgoing responses (server)     server trans id         -
or                              server trans id         FORK/-

Outgoing requests (client)      server trans id         CLIENT/client trans id

Incoming responses (client)     server trans id         CLIENT/client trans id

Based on this, it seems like the "FORK/" and "CLIENT/" are redundant,
and %y could be defined as "'-' for server transactions and the
transaction identifier for client transactions".

Also, the definitions given in 4.1.1 aren't quite correct.  E.g., one
example shows a REGISTER server transaction with no server transaction
id given (because the transmitted response is folded into the same CLF
line that logs the request), but the description of %x doesn't say that
it can be omitted in that circumstance.

Dale




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Subject: [Sipping] Support "draft-gaoyang-sipping-session-state-criterion-00.txt", and some questions.
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Dale Worley wrote:
> It would help if you replace "method" with "request" throughout,
> since "method" seems to be normally used to refer to only the method
> specified in a request, not the request as a whole.

Dale: Sure, that is a good suggestion (and I must really thank
you for going through the draft with a fine toothcomb.  More inline.)

> That makes sense, but I don't see a statement up front saying "one
> CLF line is generated upon the receipt of each SIP message (request
> or response) and one CLF is generated upon the transmission of each
> SIP message".  One has to deduce from various examples that these are
> the events that generate CLF lines.

Hmm ... our operating model was that a CLF generated by
UASes (i.e., not proxies or proxy-like B2BUAs) will result in one
line that contains all the necessary information elements (including
the response.  This, of course means, that for an INVITE, the
UAS may not generate a CLF until a final response is sent out;
and a UAC may not generate a CLF until a final response is
received.)

Practically, this means that a UAC that received multiple
provisional responses for an INVITE will not log these individually,
and a UAS that sends multiple provisional responses for an
INVITE will not log these individually.  I think it is a safe
bet to go this route and reduce some complexity when a CLF
for a UAC or UAS is being produced.  What do others think?

> I am assuming here that all provisional responses (received and sent)
>  are to be logged.

For a proxy or proxy-like B2BUA, yes; all provisionals are
logged, as are all final responses received in case of forking.

> But perhaps I am running up against a philosophical problem -- Is the
>  intention to log SIP *messages*, or to log *transactions*?  In the

Ah, good question.  Our intent was that for UAC and UAS, we will
log *messages*.  Because a proxy (or a proxy-like B2BUA) is a
transactional entity, and because such an entity may not know
the exact nature of the response until some transformation on
the request has been made, they have to be *transactional*
entities.

> The idea of using one line to give both request and response data is 
> natural for an HTTP server, where both happen at nearly the same
> moment. But in SIP, in at least half its actions, even a UA will be a
> client, where the request and response may be separated by a
> substantial time.

Right; but this is true only for the INVITE request; it is this
request that is allowed to pend in SIP.  The remaining requests
elicit a quick final response; thus for UAS and UAC, it makes sense
to use one line for the request and response (and take a bit of a
hit in form of a delay for the INVITE request.)

> The entity to which a request is sent downstream is not reliably 
> identified by the R-URI, due to all the rules in RFC 3263.

True, and it gets even murkier than this when you consider that
the topmost Route -- if present -- is used to route the requests,
thereby by-passing the R-URI completely.   But regardless, we
felt that logging the R-URI is sufficient since it demonstrates
the intent of where the request was destined to.  Presumably
to figure out the problem you mention below ...

> (Consider an element sending a request sequentially to several
> different resolutions of the R-URI in attempt to find a server that
> is functioning.)  Given our experience with sipX, I would strongly
> recommend that the triple "transport/host IP address/port" be logged
> for all sent messages. Otherwise CLF will be useless for diagnosing
> routing actions at the RFC 3263 level.

there would be some other debugging hooks in the code.  In other
words, I don't think that it is fruitful to turn the CLF in a
debugging aid.  What do you think?  Other opinions?

> But it doesn't look like %c is the contact URIs, but rather the
> contact name-addrs, based on the second example in section 4.1.4.  In
> that case, there is a lot more trouble, because a name-addr can
> contain a quote.
> 
> Consider the particularly ugly example:
> 
> Contact: <sip:[e-mail]>;param=" value1 value2 "

Hmmm ... yes, you are right.  One way would be to use other
symbols in the CLF to delimit %c.  [ and ] come to mind.

> But there is no way for a CLF parser that supports extensions to 
> determine which extensions are present, other than heuristically. 
> Maybe that this is particularly important.  Perhaps we could require 
> that extensions start with a field formatted "token[" and end with a 
> field "]", so a parser could identify the start, end, and type of
> each extension without specific knowledge of all extensions?

If it is deemed that adding other fields to the CLF is required,
and that a off-the-shelf CLF parser should not choke on these
fields, then we could certainly do what you suggest.  I would
go further and say that such "extensions" should appear after
the the normal CLF fields have taken up their positions on a
line.

> Given that %x and %y are present in response lines, and those
> identify the other requests/responses in the transaction, and
> indirectly the dialog, why is the to-tag (in %t) needed?

Because it may not be the case that the To-tag has been set
when the provisional response is sent out.  Thus we cannot
always depend on the To-tag being part of the request CLF
line if the request CLF line only contains a provisional.

> Looking at %x and %y, the server and client transaction identifiers,
> I see six cases:
[...]
> Based on this, it seems like the "FORK/" and "CLIENT/" are redundant,
> and %y could be defined as "'-' for server transactions and the 
> transaction identifier for client transactions".

I believe that retaining FORK and CLIENT directive make the intent
apparent for a human reader.  The syntax, if not the intent, of
these are modeled after the Squid web proxy CLF format.

> Also, the definitions given in 4.1.1 aren't quite correct.  E.g., one
> example shows a REGISTER server transaction with no server
> transaction id given (because the transmitted response is folded into
> the same CLF line that logs the request), but the description of %x
> doesn't say that it can be omitted in that circumstance.

OK ... we can tighten up the text to say that %x can be omitted
if the final response is on the request-CLF line.

Thanks, once again, Dale for your thorough read-through.

- vijay
-- 
Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent
1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA)
Email: vkg@{alcatel-lucent.com,bell-labs.com,acm.org}
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On Thu, 2009-02-05 at 14:55 -0600, Vijay K. Gurbani wrote:
> Ah, good question.  Our intent was that for UAC and UAS, we will
> log *messages*.

I'm getting confused here.  You say that you want to log messages, which
means that requests and responses would be logged separately.  But in
other places you talk about using one log line to represent both the
request and the response.

> Right; but this is true only for the INVITE request; it is this
> request that is allowed to pend in SIP.  The remaining requests
> elicit a quick final response; thus for UAS and UAC, it makes sense
> to use one line for the request and response (and take a bit of a
> hit in form of a delay for the INVITE request.)

Non-INVITE requests are *supposed* to elicit a quick final response, but
there are many circumstances when they don't -- especially transport
errors requiring fallback.

> In other
> words, I don't think that it is fruitful to turn the CLF in a
> debugging aid.  What do you think?  Other opinions?

Then what is its purpose?

> > Consider the particularly ugly example:
> > 
> > Contact: <sip:[e-mail]>;param=" value1 value2 "
> 
> Hmmm ... yes, you are right.  One way would be to use other
> symbols in the CLF to delimit %c.  [ and ] come to mind.

All printable ASCII characters can appear in a field-parameter.

> > Given that %x and %y are present in response lines, and those
> > identify the other requests/responses in the transaction, and
> > indirectly the dialog, why is the to-tag (in %t) needed?
> 
> Because it may not be the case that the To-tag has been set
> when the provisional response is sent out.  Thus we cannot
> always depend on the To-tag being part of the request CLF
> line if the request CLF line only contains a provisional.

Good point.

Dale




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Dale Worley wrote:
> I'm getting confused here.  You say that you want to log messages, which
> means that requests and responses would be logged separately.  But in
> other places you talk about using one log line to represent both the
> request and the response.

That is because, given how SIP works, for a proxy we simply do
not have the luxury of using the same line to log a request
and a response.

>> In other
>> words, I don't think that it is fruitful to turn the CLF in a
>> debugging aid.  What do you think?  Other opinions?
> 
> Then what is its purpose?

It's purpose is much the same as the Apache CLF format: it is
not used as much to debug as it is used for trend analysis and
anomaly detection.

>>> Consider the particularly ugly example:
>>>
>>> Contact: <sip:[e-mail]>;param=" value1 value2 "
>> Hmmm ... yes, you are right.  One way would be to use other
>> symbols in the CLF to delimit %c.  [ and ] come to mind.
> 
> All printable ASCII characters can appear in a field-parameter.

Sigh -- yes, true.  Something else needs to be thought about
here.

Thanks,

- vijay
-- 
Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent
1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA)
Email: vkg@{alcatel-lucent.com,bell-labs.com,acm.org}
Web:   http://ect.bell-labs.com/who/vkg/


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The concept is interesting.  I think that the draft could be improved in
some ways:

- The names of the parameters are not so easy to remember.  I would
suggest "min", "max", and "average".

- More thought probably needs to be put into the real algorithm, which
accommodates possibly having all 3 parameters set, as well as various
subsets.

- I expect it would be useful to have more explicit language specifying
how the subscriber requests particular parameters, how the notifier
agrees or not to those values, how they get un-set, etc.  It seems that
a request/response negotiation is expected, and there are a lot of grey
areas, but I think it would help to explicate the possibilities.

- Similarly, language should be added to make it clear that the notifier
SHOULD do what is asked, and the subscriber needs to be prepared for
behavior much different from what is asked.

- In regard to averaging, it turns out that you can make a spreadsheet
to apply the average rule.  For example, the attached spreadsheet (if it
comes through), is the case:  average = 10 sec, period = 100 sec, an
initial event at 0 sec.  The graph panel shows the successive timeout
values.  You can change the average and period values and the
spreadsheet will update the results.

- A little fiddling suggests that setting period to 10*average gives
good results -- the timeout values quickly converge to the desired
interval.  Plugging that into the formula of section 6.2 gives

timeout = average * (count of notifications in last 10*average) / 10

- Brian Rosen suggests a moving average instead of the interval-count.
But an easier formula to implement is an exponential-smoothing formula:

timeout =
     (1 + alpha - beta) * (last timeout value)
     - alpha * (interval since last notification)
     + beta * average

That has the same general properties -- if a stimulated event causes the
interval since the last notification to be small, it increases timeout
for the next few notifications.  But it requires remembering only two
numbers about the past:  the last timeout and the time of the last
notification.

Dale


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On Thu, 2009-02-05 at 16:56 -0600, Vijay K. Gurbani wrote:
> It's purpose is much the same as the Apache CLF format: it is
> not used as much to debug as it is used for trend analysis and
> anomaly detection.

Which means that the intended consumer of CLF is software, not humans.
In that case, I would recommend making CLF as *uniform* as possible,
which suggests that it *always* log either transactions (one line
documenting request and final response), or messages (one line for each
request and response).  Allowing two varieties increases the complexity
of the consumer.

Dale




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I approve the points in this paper. It could avoid the dispute about the session state after unsuccessful re-INVITE, especially in precondition case in rfc 3312.
   

       
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<div>I approve the points in this paper. It could avoid the dispute about the session state after unsuccessful re-INVITE, especially in precondition case in rfc 3312.</div>  <div>&nbsp;</div><p>&#32;


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Dale Worley wrote:
> On Thu, 2009-02-05 at 16:56 -0600, Vijay K. Gurbani wrote:
>> It's purpose is much the same as the Apache CLF format: it is
>> not used as much to debug as it is used for trend analysis and
>> anomaly detection.
> 
> Which means that the intended consumer of CLF is software, not humans.

Dale: I will agree that the preponderance of usage will be for
automata, but it benefits the human user as well to see the CLF
entries being produced in real-time.  IT departments routinely
keep a (human) eye on the Apache CLF as a sanity check, if not
anything else.

> In that case, I would recommend making CLF as *uniform* as possible,
> which suggests that it *always* log either transactions (one line
> documenting request and final response), or messages (one line for each
> request and response). 

But this is hard to do given how SIP works.  For instance, if an
automata is being trained, it helps to have the provisional
responses being logged before a final is seen.  In the event that
we use a one line documenting request and final response, we
loose this critical piece of state machinery.  Likewise, for a
proxy that forks, representing the forked branches and their
machinations in one line is near impossible.

> Allowing two varieties increases the complexity
> of the consumer.

I do agree, but unfortunately the complexity is unavoidable
given how the protocol works.

Thanks,

- vijay
-- 
Vijay K. Gurbani, Bell Laboratories, Alcatel-Lucent
1960 Lucent Lane, Rm. 9C-533, Naperville, Illinois 60566 (USA)
Email: vkg@{alcatel-lucent.com,bell-labs.com,acm.org}
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Cc: sipping <[e-mail]>
Subject: Re: [Sipping] SIP CLF Format
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Agreed.

On Feb 5, 2009, at 6:21 PM, Dale Worley wrote:

> On Thu, 2009-02-05 at 16:56 -0600, Vijay K. Gurbani wrote:
>> It's purpose is much the same as the Apache CLF format: it is
>> not used as much to debug as it is used for trend analysis and
>> anomaly detection.
>
> Which means that the intended consumer of CLF is software, not humans.
> In that case, I would recommend making CLF as *uniform* as possible,
> which suggests that it *always* log either transactions (one line
> documenting request and final response), or messages (one line for  
> each
> request and response).  Allowing two varieties increases the  
> complexity
> of the consumer.
>
> Dale
>
>
> _______________________________________________
> Sipping mailing list  https://www.ietf.org/mailman/listinfo/sipping
> This list is for NEW development of the application of SIP
> Use [e-mail] for questions on current sip
> Use [e-mail] for new developments of core SIP


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From: "Brian Rosen" <[e-mail]>
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Subject: Re: [Sipping] Comments on draft-niemi-sipping-event-throttle-07.txt
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I'd be okay with exponential-smoothing.  It's better than what is there.
Not quite as good as moving average.  

Brian

> -----Original Message-----
> From: [e-mail] [mailto:[e-mail]] On
> Behalf Of Dale Worley
> Sent: Thursday, February 05, 2009 5:13 PM
> To: SIPPING
> Subject: [Sipping] Comments on draft-niemi-sipping-event-throttle-
> 07.txt
> 
> The concept is interesting.  I think that the draft could be improved
> in some ways:
> 
> - The names of the parameters are not so easy to remember.  I would
> suggest "min", "max", and "average".
> 
> - More thought probably needs to be put into the real algorithm, which
> accommodates possibly having all 3 parameters set, as well as various
> subsets.
> 
> - I expect it would be useful to have more explicit language specifying
> how the subscriber requests particular parameters, how the notifier
> agrees or not to those values, how they get un-set, etc.  It seems that
> a request/response negotiation is expected, and there are a lot of grey
> areas, but I think it would help to explicate the possibilities.
> 
> - Similarly, language should be added to make it clear that the
> notifier SHOULD do what is asked, and the subscriber needs to be
> prepared for behavior much different from what is asked.
> 
> - In regard to averaging, it turns out that you can make a spreadsheet
> to apply the average rule.  For example, the attached spreadsheet (if
> it comes through), is the case:  average = 10 sec, period = 100 sec, an
> initial event at 0 sec.  The graph panel shows the successive timeout
> values.  You can change the average and period values and the
> spreadsheet will update the results.
> 
> - A little fiddling suggests that setting period to 10*average gives
> good results -- the timeout values quickly converge to the desired
> interval.  Plugging that into the formula of section 6.2 gives
> 
> timeout = average * (count of notifications in last 10*average) / 10
> 
> - Brian Rosen suggests a moving average instead of the interval-count.
> But an easier formula to implement is an exponential-smoothing formula:
> 
> timeout =
>      (1 + alpha - beta) * (last timeout value)
>      - alpha * (interval since last notification)
>      + beta * average
> 
> That has the same general properties -- if a stimulated event causes
> the interval since the last notification to be small, it increases
> timeout for the next few notifications.  But it requires remembering
> only two numbers about the past:  the last timeout and the time of the
> last notification.
> 
> Dale




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Thread-Topic: SIPPING WG Status - 10 February 2009
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From: "Mary Barnes" <[e-mail]>
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Subject: [Sipping] SIPPING WG Status - 10 February 2009
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 Hi all,=20

The spreadsheets tracking the SIPPING WG chartered items have been
updated:
http://www.softarmor.com/sipping/process/wg-review/sipping-rt.html
(sorted by Review due date - most useful for WG to know what they should
be reviewing now)=20

http://www.softarmor.com/sipping/process/wg-review/sipping-rt-rev-due.ht
ml
(sorted by revision due date - most useful for doc editors to know when
their next update is expected). =20


The milestones for many of the docs have been changed to account for
additional delays in updates post-IETF 73. I will post a summary of the
new proposed milestones shortly.


Regards,
Mary
SIPPING WG co-chair

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Docs with WG reviews completed (since Dec 4, 2008):=20
------------------------------------------------------------------------
Note: plans/status of docs is given in subsequent section

- draft-johnston-sipping-cc-uui (pre-WGLC ended on 22 Dec 2008)
Editor: Alan Johnston
Reviewers: Vijay Gurbani, Keith Drage, Laura Liess, Spencer Dawkins

- draft-ietf-sipping-presence-scaling-requirements-02 (post-WGLC ended
19 Dec 2008)
Editor: Avshalom Houri
Reviewers:  Vijay Gurbani, Jean-Francois Mule, Hisham Khartibil
(RAI/SIMPLE WG), Christian Schmidt

- draft-sinnreich-sip-tools (Expert Re-Review ended on 31 December 2008)
Editor: Henry Sinnreich
(Expert) Reviewer: Paul Kyzivat

- draft-ietf-sipping-update-pai (2nd WGLC ended on 19 Jan 2009)
Editor: John Elwell
Token: AD
Reviewers: Vijay Gurbani, Paul Kyzivat, Francois Audet, Thomas Stach
Proto: Gonzalo/Mary

- draft-niemi-sipping-event-throttle  (Pre-WGLC ended on 5 Feb 2009 )
Editor: Salvatore Loreto=20
Reviewers:  Brian Rosen, Hisham Khartabil, Dale Worley



Docs forwarded to IESG(since Dec 4):=20
--------------------------------------
- draft-andreasen-sipping-rfc3603bis  (in RFC Editor Q)=20
Editor: Fleming Andreasen
(Expert) Reviewer: Miguel Garcia
Token: AD (Cullen)
Proto: Mary

- draft-ietf-sipping-update-pai
Editor: John Elwell
Token: AD
Reviewers: Vijay Gurbani, Paul Kyzivat, Francois Audet, Thomas Stach
Proto: Gonzalo/Mary


Docs under review/discussion:
--------------------------------------------
- draft-ietf-sipping-nat-scenarios-09 (post-WGLC Review ended: 15
October 2008, extended to acct for TURN WGLC ending 27 November 2008)
Editor: Chris Boulton
Token: Reviewers to provide feedback and editor to respond to feedback
(currently remaining feedback is due from TURN experts - TURN WGLC ended
27 November)
Reviewers:  Vijay Gurbani, Francois Audet, Remi Denis-Courmant, Ali
Keranen, Jerry Yin, Dan Wing, Philip Matthews
Proto: Mary


- draft-wing-sipping-srtp-key-04 (Security directorate early review ends
31 Dec 2008)
Editor: Dan Wing
Reviewer: Eric Rescorla
Token: Reviewer to provide feedback on the specific solution proposals,
WG to provide any relevant feedback - based feedback from WG had
indicated general support for this doc
Chair prime: Gonzalo


- draft-ietf-sipping-presence-scaling-requirements-03 (post-WGLC
re-review ends on 23 Feb 2009)
Editor: Avshalom Houri
Token: Editor to ensure all post-WGLC comments are addresed and doc is
updated.=20
- Once doc is updated and reviewers are satisfie Proto write-up will be
completed and doc forwarded to AD (by 31 Dec 2008)
Reviewers:  Vijay Gurbani, Jean-Francois Mule, Hisham Khartibil
(RAI/SIMPLE WG), Christian Schmidt
Proto: Gonzalo



Doc revisions awaited:
-------------------------------------------

- draft-johnston-sipping-cc-uui (WGLC targeted for 16 Feb 2009)
Editor: Alan Johnston
Token: Editor to incorporate feedback based on pre-WGLC reviews. Update
due on or before 13 Feb 2009.=20
Reviewers: Vijay Gurbani, Keith Drage, Laura Liess, Spencer Dawkins
Proto: Gonzalo=20


- draft-ietf-sipping-profile-datasets  (Pre-WGLC review re-targeted to
start 23 February 2009, WGLC review retargeted to start 30 April 2009)
Editor: Martin Dolly and Dale Worley
Token: Editors to update doc on or before 20 Feb 2009, incorporating WG
feedback from past reviews and ML.=20
Reviewers:  Dale Worley, Jean-Luc Bakker, Andrew Hutton
Proto: Mary
Note: we need two more reviewers for this doc, including an XML schema
expert, as well as someone who is very familiar with SIP device
configuration.=20


- draft-niemi-sipping-event-throttle  (Pre-WGLC re-review targeted to
start 27 February 2009, WGLC review retargeted to start 20 April 2009)
Editor: Salvatore Loreto
Token: Editor to update doc on or before 20 Feb 2009, incorporating WG
feedback from past reviews and ML.=20
Reviewers:  Brian Rosen, Hisham Khartabil, Dale Worley
Proto: Mary
Note: WG needs to consider readiness for this doc as a WG item
considering that it was originally discussed in the WG in 2004 and got
lost (likely in the leadership transition in 2006).  It is also an OMA
dependency.=20


- draft-ietf-sipping-overload-design  (Initial Review retargeted to
start 16 March 2009, WGLC retargeted to start 23 May 2009)
Editor: Volker Hilt
Token: Editor to update doc, before 9 March 2009, based on initial
feedback and IETF-73 discussion
Reviewers:  None=20
Proto: Mary
Note: We need volunteers for this doc! We can't progress work unless we
get at least 3 comprehensive reviews, otherwise we assume no one cares


- draft-sinnreich-sip-tools=20
Editor: Henry Sinnreich
(Expert) Reviewer: Paul Kyzivat
Token: Editor to update doc based on -04 feedback
- Once reviewers are okay with doc, it will be forwarded to AD for
progression (Ind/AD).=20
Proto: Mary
Note: also captured as a RAI area review



Additional WG docs:
-----------------------------
- draft-ietf-sipping-sip-offeranswer (Doc being work post-Pub-Req to
work out solutions to problems ID'ed in section 6 - solutions will be
progressed in SIP WG and this doc updated to be a comprehensive guide. )
Editor: Paul Kyzivat
Token: Editor to update document once solutions agree in SIP WG - likely
in the latter half of 2009.
Reviewers: (Past) Byron Campen, Jonathan Rosenberg, Rajeev Seth, B.
Nataraju  - addt'l reviewers welcome.=20



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Thread-Topic: [PMOL] [Sipping] RE: draft-ietf-pmol-sip-perf-metrics-02
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References: <[e-mail]>
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To: "Gerald Q. Maguire Jr." <[e-mail]>
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Gerald,

Thank you for the review and detailed feedback.  I made changes in the
draft per all of your suggestions; however, I modified some of them.
See commments in-line...

Regards,

Daryl


----------------
Daryl Malas
CableLabs
(o) [phone]
(f) [phone]
mailto:[e-mail]
=20

> -----Original Message-----
> From: Gerald Q. Maguire Jr. [mailto:[e-mail]]=20
> Sent: Tuesday, November 11, 2008 9:02 AM
> To: Daryl Malas
> Subject: draft-ietf-pmol-sip-perf-metrics-02
>=20
> http://tools.ietf.org/html/draft-ietf-pmol-sip-perf-metrics-02
>=20
> When measurement results will be correlated with other results or
>    information using time-of-day stamps, then the time clock that
>    supplies T1 SHOULD be synchronized to a primary time source, to
>    minimize the time offset.
> should be:
>=20
> When measurement results will be correlated with other results or
>    information using time-of-day stamps, then the time clock that
>    supplies T1 SHOULD be synchronized to a primary time source, to
>    minimize the error in the time offset.
>=20
> This change is important as otherwise you have used "time=20
> offset" in a different meaning that you defined it in the=20
> prior paragraph.

After considering your suggestion, I modified the paragraph to read:

When measurement results will be correlated with other results or
    information using time-of-day stamps, then the time clock that
    supplies T1 SHOULD be synchronized to a primary time source, to
    minimize the error in the time offset. The time offset MUST be
    reported with each measurement.

>=20
> --
> =20
> The accuracy of the T4-T1 interval is also critical to maintain and
>    report. The relevant definition from [12=20
> <http://tools.ietf.org/html/draft-ietf-pmol-sip-perf-metrics-0
> 2#ref-12>] is "skew": the difference
>    between time offsets at T1 and T4 is the error for the measurement
>    interval associated with the clock's skew.
> should be:
>=20
> The accuracy of the T4-T1 interval is also critical to maintain and
>    report. The difference in errors=20
>    between the the time offsets at T1 and T4 is associated=20
> with the clock's skew[12=20
> <http://tools.ietf.org/html/draft-ietf-pmol-sip-perf-metrics-0
> 2#ref-12>].

I used the above paragraph suggestion.

>=20
> Skew is according to the definition you cite in [12] related=20
> to the difference in clock frequency between a true clock and=20
> the local clock.
> ("A clock's "skew" at a particular moment is the frequency difference
>    (first derivative of its offset with respect to true time) between
>    the clock and true time.[12])
>=20
> More properly the statement might be:
> The accuracy of the measurement of the T4-T1 interval is critical and
>    should be reported. The difference in errors=20
>    between the the time offsets at T1 and T4 is associated=20
> with the clock's skew[12=20
> <http://tools.ietf.org/html/draft-ietf-pmol-sip-perf-metrics-0
> 2#ref-12>] and the clock's "drift".
>=20
> Even more formally this is because the (local) clock's=20
> "offset" at T1 and the (local) clock's "offset" at T4 are not=20
> the same, due to the (local) clock's skew and drift (the 1st=20
> and 2nd derivatives of the clock's frequency).
>=20
> Here I have used "clock's offset" as defined in [12].
>=20
> ---
>=20
> The clock error SHOULD
>    be constrained to less than +/- 1 ms, implying 1 part per 1000
>    frequency accuracy for a 1 second interval.
> should be:
> The clock error SHOULD
>    be constrained to less than +/- 1 ms. This implies a=20
> frequency stability of greater 1 part per 1000
>    for a 1 second interval. This implies greater stability is=20
> required as the length of the T4-T1 increases,
>    in order to constrain the error to be less than +/- 1 ms.
>=20
> ---
> The following statement, seems to imply that reading the time=20
> from a clock requires interrupt processing and this need not=20
> be the case.
>=20
> The physical operation of reading time from a clock may be
>    constrained by the delay to service the interrupt. Therefore, the
>    accuracy of the time stamp read at T1 or T4 always includes the
>    interrupt delay, and this source of error SHOULD be known and
>    included in the error assessment.
> =20
> It would be better to say:
> The physical operation of reading time from a clock may be
>    constrained by the delay to service the interrupt.=20
> Therefore, if the
>    accuracy of the time stamp read at T1 or T4 includes
>    interrupt delay, then this source of error SHOULD be known and
>    included in the error assessment.
>=20
> ---
>=20
> There is also some confusion when you introduce the statement:
> =20
> 2. If a free-running clock is used to make the time interval
>       measurement, then value of T1 reported SHOULD be derived from a
>       different clock that meets the time of day accuracy requirements
>=20
> Since if you are measuring the T1 to T4 interval using such a=20
> clock, then there need not be a time of day measurement for=20
> T4, but rather an estimate of T4 based upon the measured=20
> intervals (measured using the free running clock) described=20
> above. Thus it is quite common today to measure a short time=20
> interval using the CPU's internal counter driven by the CPU=20
> clock (often as a RTC), this time interval can often be much=20
> higher resolution and have a much higher stability that the=20
> time of day clock.
> Additionally this clock generally is accessed by a read=20
> register operation and not an interrupt. (Note that you still=20
> have to state the relationship between this clock and the=20
> time of day clock in order to specify when the measurement=20
> occurred - the time of day of T1.)
>=20

I modified the paragraph to read:

 If a free-running clock is used to make the time interval measurement,
then the time of day reported with the measurement (which is normally
timestamp T1) SHOULD be derived from a different clock that meets the
time of day accuracy requirements...

> ---
>=20
> I do not think that the following statement is correct - from=20
> a statistical data analysis point of view:
> =20
> In regards to all of the metrics, the output values are directly
>    related to the accuracy and the equivalent level of granularity of
>    the input values.
>=20
> The word "directly" is not strictly true. Perhaps the=20
> following might be better:
>=20
> In regards to all of the metrics, the accuracy and=20
> granularity of the output values are
>    related to the accuracy and granularity of
>    the input values.
>=20
> ---
> Registration Request Delay is utilized to detect failures or
>    impairments causing delays in responding to a UAC REGISTER request.
>    RRD SHALL be measured and reported only for successful REGISTER
>    requests, and Ineffective Registration Attempts (Section=20
> 4.2=20
> <http://tools.ietf.org/html/draft-ietf-pmol-sip-perf-metrics-0
> 2#section-4.2>) SHALL
>    be reported for failures.  This metric is measured at the UAC.  The
>    output value of this metric is numerical and SHOULD be adjusted to
>    indicate milliseconds.  The following represents the=20
> calculation for
>    this metric:
> should be:
>=20
> Registration Request Delay is a measurement of the delay in=20
> responding to a UAC REGISTER request.
>    RRD SHALL be measured and reported only for successful REGISTER
>    requests, while Ineffective Registration Attempts (Section=20
> 4.2=20
> <http://tools.ietf.org/html/draft-ietf-pmol-sip-perf-metrics-0
> 2#section-4.2>) SHALL
>    be reported for failures.  This metric is measured at the UAC.  The
>    output value of this metric is numerical and SHOULD be=20
> stated in units of milliseconds.
>    The following represents the calculation for this metric:
>=20
> The changes are necessary since:
> 1. RRD does not provide any information in the case of failures!
> 2. The measured value is stated in milliseconds - since you=20
> have previously
>    stated that the clock error should be less than +/- 1=20
> millisecond. Of course from
>    a statistical point of view - the measured value can only=20
> be considered to be in units
>    of 2 milliseconds - since if you want to have 1=20
> millisecond accuracy, then the clock
>    has to be accurate to better than +/- 0.5 milliseconds=20
> (since the measurement is an
>    interval between to clock values).
>=20
> Note that throughout the text you should be stating that it=20
> is not an adjustment to milliseconds, but rather that this is=20
> simply the units used for this measurement.
>=20
> ---
> In a successful registration attempt, RRD is defined as the time
>    interval from the moment the initial REGISTER message=20
> containing the
>    necessary information is passed by the originating UAC to the
>    intended registrar until the 200 OK is received indicating the
>    registration attempt has completed successfully.  This dialog
>    includes an expected authentication challenge prior to=20
> receiving the
>    200 OK as describe in the following registration flow examples.
>=20
> In a successful registration attempt, RRD is defined as the time
>    interval from the first bit of the initial REGISTER message being
>    transmitted by the originating UAC to the
>    intended registrar until the 200 OK is last bit of the=20
> response indicating the
>    registration attempt has completed successfully has been=20
> received.  This dialog
>    includes any expected authentication challenge prior to=20
> receiving the
>    200 OK as describe in the following registration flow examples.
>=20
> I think that the above changes are necessary because of the=20
> way you defined T1 and T4; and the fact that an challenge=20
> might not occur (or even need to occur) - thus the interval=20
> only includes the challenge and response if they are expected.

Taking into consideration your suggestion, I have modified the paragraph
to read:

In a successful registration attempt, RRD is defined as the time=20
   interval from the first bit of the initial REGISTER message
containing the=20
   necessary information is passed by the originating UAC to the=20
   intended registrar until the last bit of the 200 OK is received
indicating the=20
   registration attempt has completed successfully.  This dialog=20
   includes an expected authentication challenge prior to receiving the=20
   200 OK as describe in the following registration flow examples.


I also updated all other metrics with a result of time to align with
this.

> ---
>=20
>=20
>  Ineffective registration attempts are utilized to detect failures or
>    impairments causing an inability for a registrar to receive or
>    respond to a UAC REGISTER request.  This metric is measured at the
>    UAC.  The output value of this metric is numerical and SHOULD be
>    adjusted to indicate a percentage of registration attempts.
> should be:
>  Ineffective registration attempts are utilized to monitor=20
> registration failures,
>    i.e. the inability for a registrar to receive or
>    respond to a UAC REGISTER request.  This metric is measured at the
>    UAC.  The output value of this metric is numerical and SHOULD be
>    reported as a percentage of registration attempts.
> ---
> You say:
> IRA may be
>    used to detect problems in downstream signaling functions,=20
> which may
>    be impairing the REGISTER message from reaching the intended
>    registrar; or, it may indicate a registrar has become=20
> overloaded and
>    is unable to respond to the request.
>=20
> However, I would think of the first problem being upstream=20
> signaling - affecting the REGISTER message from reaching the=20
> registration, while downstream signaling problems would be=20
> reflected in the register's response not being able to reach the UAC.
>=20

This was not worded well in the last revision and was noted to create
confusion during the last working group session, so I have modified the
paragraph to read:

Ineffective registration attempts are utilized to detect failures or=20
   impairments causing an inability for a registrar to receive a UAC
REGISTER request.
   This metric is measured at the UAC.  The output value of this metric
is numerical
   and SHOULD be reported as a percentage of registration attempts.


> ---
>=20
> There should also be a statement with regard to the first=20
> figure on page 8 of if the Total number of REGISTER Requests=20
> increases by 3 or if these 3 attempts at transmission are=20
> part of a single registration attempt.

I agree this is confusing.  I have added the following paragraph under
the signaling flow example:

In the previous message flow the UAC retries a REGISTER request multiple
times
     before the timer, indicating the failure, expires.  Only the first
REGISTER request MUST
     used for input to the calculation and an IRA.  Subsequent REGISTER
retries are identified
     by the same Call-ID and MUST be ignored for purposes of metric
calculation.  This ensures
     an accurate representation of the metric output.=20

>=20
> ---
>=20
>=20
>       Session Request Delay (SRD)is not a metric, but rather a set of
>       metrics. This is the case because you do not combine successful
>       and failed responses in the same result. Thus any=20
> result has to be
>       reported also stateing which type of SRD it is.

The following sentence has been added to the SRD introduction paragraph:

The output value of this metric=20
   MUST indicate whether the output is for successful or failed session
requests and
   SHOULD be stated in units of seconds.

>=20
> ---
>=20
> The output value of this metric is
>    numerical and SHOULD be adjusted to indicate seconds.
> should be:
>=20
> The output value of this metric is
>    numerical and SHOULD be reported in units of seconds.=20
>=20
> ---
>=20
> Regards,
> G. Q. "Chip" Maguire Jr.
>=20
>=20
>=20


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Thread-Topic: IETF-74 Deadlines/agenda, new document template (RFC 5378) and RAI restructuring. 
Thread-Index: AcmLsflzX764IRJmQL26VNMTlQsTsg==
From: "Mary Barnes" <[e-mail]>
To: "IETF Sipping List" <[e-mail]>
Cc: [e-mail], sipping chairs <[e-mail]>
Subject: [Sipping] IETF-74 Deadlines/agenda, new document template (RFC 5378) and RAI restructuring.
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Hi folks,

I have 4 items of note below:

1) Deadlines for IETF-74 are very near:
http://www.ietf.org/meetings/74/cutoff-dates.html

-00 docs must be submitted by March 2, 2009 Monday (< 3 weeks) -
Internet Draft Cut-off for initial document (-00) submission by 17:00
PST (01:00 Tuesday, March 3 UTC/GMT), (and please) upload using IETF ID
Submission Tool <https://datatracker.ietf.org/idst/upload.cgi> . =20

-01+ docs must be submitted by March 9, 2009 Monday (< 4 weeks) -
Internet Draft final submission cut-off by 17:00 PDT (24:00 UTC/GMT)=20


2)  New Template requirements. =20
New template text is required for any submissions per the recently
published RFC 5378 (Contributor's rights).   There has been LOTS (more
than a few threads, days and pages) of discussion on the IETF list about
these new requirements:
https://www1.ietf.org/mailman/listinfo/ietf

I won't try to summarize all the issues highlighted (nor the proposed
resolution) as I've honestly had to talk to corporate lawyers to
understand what it means to me in terms of submitting documents. One
thing I do understand is that an editor MUST ensure that the statement
is appropriate for ALL authors/contributors.  This means that you may
have difficulty getting your documents submitted in time IF you don't
try to get the approval from your co-authors sooner rather than later -
i.e., there is no reason why you can't shoot that email off today.
And, you may need to talk to your lawyers before you submit a document
as well - in my experience this can take some time.=20

3) Agenda Requests.
As usual, please send any agenda requests to chairs and Oscar (cc'ed
above) - all 3 please, otw we end up forwarding to one another and we
each get 3 copies. =20

The deadline for the preliminary agenda is March 11, 2009, with the
final/updated agenda due on March 16, 2009.  Please note that as usual,
agenda time is first given to WG items, then to items based upon the
level of discussion. Thus, waiting until March 2nd or 9th to submit a
contribution and elicit feedback is not particularly effective. =20

Here's the usual template that makes things easier in creating the
agenda - it also ensures that we don't make clerical errors in the
process:

<tr>
         <td><a href=3D"mailto:[e-mail]">
Gonzalo Camarillo</a></td>
         <td>Exploders</td>
         <td><center>5</center></td>
         <td>
<a
href=3D"http://www.ietf.org/internet-drafts/draft-camarillo-sipping-explo=
d
ers-02.txt">
draft-camarillo-sipping-exploders-02.txt</a></td>
       </tr>


4) RAI restructuring.=20
If you're not on the RAI area mailing list, you might want to at least
review the archives as there is ongoing discussion wrt RAI area
restructuring:
https://www1.ietf.org/mailman/listinfo/rai

If you don't want to bother with that, you should at least look at the
proposed changes to the "SIP change" process:
http://svn.resiprocate.org/rep/ietf-drafts/fluffy/draft-peterson-rai-rfc
3427bis-01a.txt

Note that Jon has not yet submitted due to 2) above.  This is your
chance as contributors and participants to provide input to make our
work more effective and meet the requirements of the constituency.
Please direct any feedback to the RAI area list ONLY.=20

Regards,
Mary
SIPPING WG co-chair

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<P><FONT SIZE=3D2 FACE=3D"Arial">Hi folks,</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">I have 4 items of note below:</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">1) Deadlines for IETF-74 are very =
near:</FONT>

<BR><A =
HREF=3D"http://www.ietf.org/meetings/74/cutoff-dates.html"><U><FONT =
COLOR=3D"#0000FF" SIZE=3D2 =
FACE=3D"Arial">http://www.ietf.org/meetings/74/cutoff-dates.html</FONT></=
U></A>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">-00 docs must be submitted by</FONT> =
<FONT SIZE=3D2 FACE=3D"Arial">March 2, 2009 Monday (&lt; 3 weeks) - =
Internet Draft Cut-off for initial document (-00) submission by 17:00 =
PST (01:00 Tuesday, March 3 UTC/GMT), (and please) upload using =
</FONT><A HREF=3D"https://datatracker.ietf.org/idst/upload.cgi"><U><FONT =
COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">IETF ID Submission =
Tool</FONT></U></A><FONT SIZE=3D2 FACE=3D"Arial">.&nbsp; </FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">-01+ docs must be submitted by March 9, =
2009 Monday (&lt; 4 weeks) - Internet Draft final submission cut-off by =
17:00 PDT (24:00 UTC/GMT) </FONT></P>
<BR>

<P><FONT SIZE=3D2 FACE=3D"Arial">2)&nbsp; New Template =
requirements.&nbsp; </FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">New template text is required for any =
submissions per the recently published RFC 5378 (Contributor's =
rights).&nbsp;&nbsp; There has been LOTS (more than a few threads, days =
and pages) of discussion on the IETF list about these new =
requirements:</FONT></P>

<P><A HREF=3D"https://www1.ietf.org/mailman/listinfo/ietf"><U><FONT =
COLOR=3D"#0000FF" SIZE=3D2 =
FACE=3D"Arial">https://www1.ietf.org/mailman/listinfo/ietf</FONT></U></A>=

</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">I won't try to summarize all the issues =
highlighted (nor the proposed resolution) as I've honestly had to talk =
to corporate lawyers to understand what it means to me in terms of =
submitting documents. One thing I do understand is that an editor MUST =
ensure that the statement is appropriate for ALL =
authors/contributors.&nbsp; This means that you may have difficulty =
getting your documents submitted in time IF you don't try to get the =
approval from your co-authors sooner rather than later - i.e., there is =
no reason why you can't shoot that email off today.&nbsp;&nbsp; And, you =
may need to talk to your lawyers before you submit a document as well - =
in my experience this can take some time. </FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">3) Agenda Requests.</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">As</FONT> <FONT SIZE=3D2 =
FACE=3D"Arial">usual, please send any agenda requests to chairs and =
Oscar (cc'ed above) - all 3 please, otw we end up forwarding to one =
another and we each get 3 copies.&nbsp; </FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">The deadline for the preliminary agenda =
is March 11, 2009, with the final/updated agenda due on March 16, =
2009.&nbsp; Please note that as usual, agenda time is first given to WG =
items, then to items based upon the level of discussion. Thus, waiting =
until March 2nd or 9th to submit a contribution and elicit feedback is =
not particularly effective.&nbsp; </FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Here's the usual template that makes =
things easier in creating the agenda - it also ensures that we don't =
make clerical errors in the process:</FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">&lt;tr&gt;</FONT>

<BR><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;td&gt;&lt;a href=3D&quot;<A =
HREF=3D"mailto:[e-mail]">mailto:Gonzalo.Camarillo@e=
ricsson.com</A>&quot;&gt;</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">Gonzalo =
Camarillo&lt;/a&gt;&lt;/td&gt;</FONT>

<BR><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;td&gt;Exploders&lt;/td&gt;</FONT>

<BR><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;td&gt;&lt;center&gt;5&lt;/center&gt;&lt;/td&gt;</FONT>

<BR><FONT SIZE=3D2 =
FACE=3D"Arial">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;td&gt;</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">&lt;a</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">href=3D&quot;<A =
HREF=3D"http://www.ietf.org/internet-drafts/draft-camarillo-sipping-explo=
d">http://www.ietf.org/internet-drafts/draft-camarillo-sipping-explod</A>=
</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">ers-02.txt&quot;&gt;</FONT>

<BR><FONT SIZE=3D2 =
FACE=3D"Arial">draft-camarillo-sipping-exploders-02.txt&lt;/a&gt;&lt;/td&=
gt;</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;/tr&gt;</FONT>
</P>
<BR>

<P><FONT SIZE=3D2 FACE=3D"Arial">4) RAI restructuring. </FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">If you're not on the RAI area mailing =
list, you might want to at least review the archives as there is ongoing =
discussion wrt RAI area restructuring:</FONT></P>

<P><A HREF=3D"https://www1.ietf.org/mailman/listinfo/rai"><U><FONT =
COLOR=3D"#0000FF" SIZE=3D2 =
FACE=3D"Arial">https://www1.ietf.org/mailman/listinfo/rai</FONT></U></A>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">If you don't want to bother with that, =
you should at least look at the proposed changes to the &quot;SIP =
change&quot; process:</FONT>

<BR><A =
HREF=3D"http://svn.resiprocate.org/rep/ietf-drafts/fluffy/draft-peterson-=
rai-rfc3427bis-01a.txt"><U><FONT COLOR=3D"#0000FF" SIZE=3D2 =
FACE=3D"Arial">http://svn.resiprocate.org/rep/ietf-drafts/fluffy/draft-pe=
terson-rai-rfc3427bis-01a.txt</FONT></U></A>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Note that Jon has not yet submitted due =
to 2) above.&nbsp; This is your chance as contributors and participants =
to provide input to make our work more effective and meet the =
requirements of the constituency. Please direct any feedback to the RAI =
area list ONLY. </FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Regards,</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">Mary</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">SIPPING WG co-chair</FONT>
</P>

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Date: Tue, 10 Feb 2009 21:10:07 +0200
From: Valentin Nechayev <[e-mail]>
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Subject: [Sipping] late OAM consistency question
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Hi,
There is late offer-answer model (offer in 200, answer in ACK)
according to RFC3261 par.13 and RFC3264. In it, if the transaction
requester don't accept the offer, the only correct action is to
confirm transaction (sending ACK) but then immediately stop the
call with BYE. Am I right in this? If yes, I have the question _why_
this approach was selected among another possible ones:

1. Send ACK without SDP leaving UAs in state "established dialog, but
no session" with need to negotiate session;
2. Send negative opposition of ACK (name it here "NAK"); this also
would be useful in some other cases not related to session itself
(want to cancel request when final response is unacceptable);
3. Send ACK but with special rejecting description (this is kind
of merge of 1 and 2);
4. Disable responding with ACK totally, causing here UAS timeout
trigger and stopping the call on opposite side;
5. Require 100rel to work with late OAM, send offer SDPs only in
1xx and respond with answer in PRACK;
6. something else?

The problem I need to solve is to embed late OAM implementation
properly into existing stack with own complex processing which
doesn't restore after misconfirmed offers...

-- 
Valentin Nechayev
PortaOne Inc., Software Engineer
mailto:[e-mail]


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