[SIPForum-discussion] call-id and cseq relation -> rfc 3261 clarification help required

[rupandeep singh]

Hi,

When a INVITE for 407 is sent it is send on the same dialog so that Proxy can verify it is invite for same call for which i have send 407.
But since it would be different request and not a re-transmision of initial INVITE so Cseq increases to indicate this thing.

Hope this clarifies your doubt.

Regards
Rupandeep Singh




________________________________
 From: Vijay Badola <Vijay.Badola at onmobile.com>
To: "SAKCA, HALIT (HALIT)" <halit.sakca at alcatel-lucent.com>; "discussion at sipforum.org" <discussion at sipforum.org> 
Sent: Wednesday, April 3, 2013 2:40 PM
Subject: Re: [SIPForum-discussion] call-id and cseq relation -> rfc 3261	clarification help required
 


 
Hi,
UAC SHOULD use the same Call-ID header field value for registrations sent to a particular Registrar.
CSeq, from-tag and some other header field value will differ.
Even when UAC will go to refresh its registration SHOULD use same Call-ID header field value.
 
Regards,
Vijay Badola 
 
From:discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of SAKCA, HALIT (HALIT)
Sent: Thursday, March 28, 2013 4:58 PM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] call-id and cseq relation -> rfc 3261 clarification help required
 
Dear All,
 
Could you please help me to figure out following scenario and RFC 3261 statement?
A sip call with auth;
1.       Agcf -> INVITE  -> scscf 
2.       Agcf <- 407  <- scscf
3.       Agcf -> INVITE  -> scscf
.
.
.
 
The INVITE in 3rdhas a different call-id than the INVITE in 1st,
I see in RFC that;
 
RFC 3261 clause 22.2 states (at the end of the clause):
 
   When a UAC resubmits a request with its credentials after receiving a
   401 (Unauthorized) or 407 (Proxy Authentication Required) response,
   it MUST increment the CSeq header field value as it would normally
   when sending an updated request.
 
Does ‘Incrementing Cseq’ basically means that the CallID remains the same?
I am wondering if it is only in case the UAC RESUBMITS a request.
In request above we don't resubmit so we don't have to follow this rule.
The UAC is not obliged to resubmit. 
 
Am I correct?
 
Regards,
Halit
 
 
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