Re: [AVTCORE] WG last call on draft-ietf-avtcore-6222bis-01

["Ali C. Begen (abegen)" <[e-mail]>]

-----Original Message-----
From: Dan Wing <[e-mail]>
Date: Tuesday, March 26, 2013 5:45 PM
To: "Ali C. Begen" <[e-mail]>
Cc: Magnus Westerlund <[e-mail]>,
"[e-mail]"
<[e-mail]>, "[e-mail]" <[e-mail]>
Subject: Re: [AVTCORE] WG last call on draft-ietf-avtcore-6222bis-01

>
>On Mar 26, 2013, at 2:57 AM, Ali C. Begen (abegen) <[e-mail]>
>wrote:
>
>> -----Original Message-----
>> From: Magnus Westerlund <[e-mail]>
>> Date: Tuesday, March 26, 2013 11:49 AM
>> To: "Ali C. Begen" <[e-mail]>
>> Cc: "[e-mail]" <[e-mail]>,
>> "[e-mail]"
>> <[e-mail]>
>> Subject: Re: [AVTCORE] WG last call on draft-ietf-avtcore-6222bis-01
>> 
>>> On 2013-03-25 21:00, Ali C. Begen (abegen) wrote:
>>>> Thanks for the review.
>>>> 
>>>> On Mar 25, 2013, at 5:07 PM, "Magnus Westerlund"
>>>> <[e-mail]> wrote:
>>>> 
>>>>> wonder of its persistence behavior as it says to use the MAC of
>>>>> the Interface that ones initiate the communication over. With
>>>>> multiple interfaces, I can in the context of an application use all
>>>>> of these interfaces over a set of calls. Thus it doesn't have
>>>>> particular good long term stability either.
>>>> 
>>>> I think it is meant to say the interface over which the initial
>>>> connection was made not all other possible interfaces that could be
>>>> used during the rtp session.
>>>>> 
>>> 
>>> The main point I try to get across is that which interface you use for
>>> the initial connection varies between different communication
>>> establishments. If your goal is to have a long term persistent
>>> identifier then you need to store the first one used in the context of
>>> an application and use that, rather than take the interface you used
>>>for
>>> the SIP dialog, or similar, used to establish this particular RTP
>>> session(s).
>> 
>> The text is not saying to use MAC for long-term persistent CNAME. It
>>says
>> to use it for *short-term* persistency. Sorry, I am not getting where
>> there is unclarity.
>
>I think what Magnus is saying is that one person's long term is another
>person's short term, and the text needs to explain this situation.  How
>about this:
>
>    For the duration of an RTP session, different interfaces
>    might be used.  For example, a single RTP session might be
>    established on a WiFi interface and a mobility event moves
>    that session to a 3G interface.  When such an interface change
>    occurs, the same CNAME MUST be retained.

Regardless of what method you use to produce a CNAME or how many
interfaces you have or whether you roam from one to another during an RTP
session, you must keep the same CNAME anyway. I think we wanted to say
this thru "In either case, the procedure is performed once per
initialization of the software." But your clarification is helpful, I
agree.

>
>-d
>
>
>
>
>> 
>> 
>>> 
>>> Cheers
>>> 
>>> Magnus Westerlund
>>> 
>>> ----------------------------------------------------------------------
>>> Multimedia Technologies, Ericsson Research EAB/TVM
>>> ----------------------------------------------------------------------
>>> Ericsson AB                | Phone  [phone]
>>> Färögatan 6                | Mobile [phone]
>>> SE-164 80 Stockholm, Sweden| mailto: [e-mail]
>>> ----------------------------------------------------------------------
>>> 
>>> 
>> 
>> 
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>
>