RE: [Sipping] Requesting the publication of cc-transfer

["Agrawal, Vishal" <[e-mail]>]

Hello,

another typo...

In figure 6 the Target-Dialog in F5 should be dialog 2 and not dialog 1.

Thanks,
-Vishal

-----Original Message-----
From: Alan Johnston [mailto:[e-mail]] 
Sent: Thursday, September 13, 2007 9:36 AM
To: Ian Elz (CV/ETL)
Cc: sipping
Subject: Re: [Sipping] Requesting the publication of cc-transfer

Hi Ian,

Thanks for your comments on the draft.  We will fix the issues you raise

below.  We will check the other Replaces tags to ensure they are
correct.

Thanks,
Alan

Ian Elz (CV/ETL) wrote:
> I have been reading through this draft as much of what is included
must
> be considered for the b2bua draft.
>
> I have a couple of NITS:
>
> Section 1 refers to the Refer method and the Replaces header but there
> is no mention in the draft of the Referred-By header. While this is
> optional it may be worth showing the use of the Referred-By header in
> one of the examples.
>   
Section 8 shows the use of Referred-By, but we can mention it in Section

1 as well.
> Section 5 3rd paragraph references section 5.2. This should now read
> 6.2, there has been another section added.
>
> In some Figures where you use the Replaces= you show the replaced
dialog
> as 'dialog2' (Figure 9) and in others it is just '2' (Figures 6,7 &
8).
>
> I have an observation about Section 7.2. While this shows that either
> party in this scenario can become the transferee I am unsure how this
> hides information about the Transfer Target (performing the transfer
in
> this case). The INVITE, as shown in Figure 6, will reveal the
> information about the Transfer Target to the Transferee. If you wish
to
> show information hiding perhaps an example should include Privacy
> headers.
>
> There appears to be an issue with the To-tag and From-tag in the
> Replaces headers.
>
> Let me use Figure 6 as an example.
>
>               Transferor           Transferee             Transfer
>                    |                    |                  Target
>                    |                    |                    |
>          dialog1   | INVITE/200 OK/ACK F1 F2                 |
>                    |<-------------------|                    |
>          dialog1   | INVITE (hold)/200 OK/ACK                |
>                    |------------------->|                    |
>          dialog2   | INVITE/200 OK/ACK F3 F4                 |
>                    |---------------------------------------->|
>          dialog2   | INVITE (hold)/200 OK/ACK                |
>                    |---------------------------------------->|
>          dialog3   | REFER (Target-Dialog:1,                 |
>                    |  Refer-To:sips:Transferee?Replaces=1) F5|
>                    |---------------------------------------->|
>          dialog3   | 202 Accepted       |                    |
>                    |<----------------------------------------|
>          dialog3   | NOTIFY (100 Trying)|                    |
>                    |<----------------------------------------|
>          dialog3   |                    |            200 OK  |
>                    |---------------------------------------->|
>          dialog4   |         INVITE (Replaces:dialog1)/200 OK/ACK F6
>                    |                    |<-------------------|
>
> In this example you have shown F1 and F2 where F2 is:
>
>   F2 200 OK Transferor -> Transferee
>
>   SIP/2.0 200 OK
>   Via: SIP/2.0/TLS 192.0.2.4;branch=z9hG4bKnas432
>   To: <sips:[e-mail]>;tag=31431
>   From: <sips:[e-mail]>;tag=7553452
>   Call-ID: 090459243588173445
>   CSeq: 29887 INVITE
>   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY
>   Supported: replaces, gruu, tdialog
>   Contact: <sips:[e-mail];grid=723jd2d;gruu>
>   Content-Type: application/sdp
>   Content-Length: ...
>
> You have then used the Call-Id, To-tag and From-tag from this
> transaction to specify the Replaces values in the REFER/Replaces in F5
> as:
>
> ?Replaces=090459243588173445%3Bto-tag%3D31431%3Bfrom-tag%3D7553452
>
> The Replaces header in F6 is shown with the same to-tag and from-tag:
>
> Replaces: 090459243588173445;to-tag=31431;from-tag=7553452
>
> This is not in agreement with the contents of RFC 3891 Replaces header
> which states in Section 3:
>
>                                                    The User Agent
Server
>    (UAS) matches the to-tag and from-tag parameters as if they were
tags
>    present in an incoming request.  In other words, the to-tag
parameter
>    is compared to the local tag, and the from-tag parameter is
compared
>    to the remote tag.
>
> As the initial INVITE of dialog1, dialog to be replaced, is from the
> Transferee to the Transferor the local-tag for the Transferee is
7554542
> and the remote-tag is 31431.
>
> This means that in a Replaces header directed towards the Transferee
to
> replace dialog1 the tags should be as follows:
>        To-tag=7554542
>        From-tag=31431
>
> Thus in F6 the Replaces header should be:
>
> Replaces: 090459243588173445;to-tag=7553452;from-tag=31431
>
> Which means that the Replaces contained in the Refer-to in F5 should
be:
>
> ?Replaces=090459243588173445%3Bto-tag%3D7553452%3Bfrom-tag%3D31431
>
> Which is as if the Transferor is sending a Request directly to the
> Transferee.
>
> I have not checked the other examples to see if the same mistake has
> been made in these examples.
>
> Ian Elz
>
> Office: + 44 24 764 35256
> gsm: [phone]
> [e-mail]
>
> -----Original Message-----
> From: Gonzalo Camarillo [mailto:[e-mail]] 
> Sent: 30 August 2007 13:05
> To: sipping
> Cc: Mary Barnes
> Subject: [Sipping] Requesting the publication of cc-transfer
>
> Folks,
>
> now that the GRUU mechanism is stable, Alan has put together a new 
> revision of the cc-transfer draft that is ready for publication.
>
>
http://www.ietf.org/internet-drafts/draft-ietf-sipping-cc-transfer-08.tx
> t
>
> Please, have a look at this draft and let us know if you have
comments. 
> We intend to request its publication in a couple of weeks.
>
> Thanks,
>
> Gonzalo
>
>
>
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>
> _______________________________________________
> Sipping mailing list  https://www1.ietf.org/mailman/listinfo/sipping
> This list is for NEW development of the application of SIP
> Use [e-mail] for questions on current sip
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>
>
>   



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_______________________________________________
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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