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List:       sip-implementors
Subject:    Re: [Sip-implementors] Reg. Replaces header with REFER.
From:       "Rastogi, Vipul (Vipul)" <vrastogi () avaya ! com>
Date:       2009-05-26 11:23:23
Message-ID: 5AD1580F7BF0AC4EA6520E7157374EF232CC65 () 307873ex2 ! global ! avaya ! com
[Download RAW message or body]


 Right. RFC 3891 says so ...
3891 section 3 ->
If the Replaces header field matches an early dialog that was not
   initiated by this UA, it returns a 481 (Call/Transaction Does Not
   Exist) response to the new INVITE, and leaves the matched dialog
   unchanged.

Please go thought this link
https://lists.cs.columbia.edu/pipermail/sip-implementors/2009-May/022614
.html 

-----Original Message-----
From: sip-implementors-bounces@lists.cs.columbia.edu
[mailto:sip-implementors-bounces@lists.cs.columbia.edu] On Behalf Of
Naarumanchi Kaushik
Sent: Tuesday, May 26, 2009 3:10 PM
To: sip-implementors@lists.cs.columbia.edu
Subject: [Sip-implementors] Reg. Replaces header with REFER.

Hi All,


RFC 3891 says:
"A UAC MUST NOT send an INVITE with a Replaces header field that
attempts to replace an early dialog which was not originated by the
target of the INVITE with a Replaces header field"

For the following scenario:
         Alice                                  Bob                Devis
        | Initiates & establishes call   |                          |
        |<===================>|                          |
        | Initiates call                        |
|
        |<================================> |
        |                                          |
                    |
        |----------REFER/200------------->|                          |
        |<--NOTIFY/200(trying)----------|-INV w/Replaces->|


 Here Alice is the initiator for both the calls. After receiving REFER
from Alice, when Bob sends an INVITE with Replaces header, Should Devis
reject this call with 481 as he is not the originator of the call with
Alice? And should the call transfer be considered as failed?

Regards,
N.V.S.Kaushik.
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