[SIPForum-discussion] Re : CSeq ?

[Syed K]

Shakthi,

RFC 3261

12.2.1 UAC Behavior

          Requests within a dialog MUST contain strictly monotonically
increasing and contiguous CSeq sequence numbers (increasing-by-one) in
each direction (excepting ACK and CANCEL of course, whose numbers equal
the requests being acknowledged

or cancelled).

           For B (remote Cseq is 1 & local CSeq is not initialized) Bye
the Cseq is also correct. Before initiating a request B insert a Cseq
number by initializing local CSeq. The valid value is between (1 - 2
**31(2power 31)) and 2 is valid value.

 

 

     Thanks & Regards

Syed Nazir 

Date: Fri, 7 Sep 2007 00:09:32 -0700 (PDT)

From: Shakthi <shakthi_msc at yahoo.com>

Subject: [SIPForum-discussion] C-seq ?

To: SIP <discussion at sipforum.org>

Message-ID: <372815.46728.qm at web32410.mail.mud.yahoo.com>

Content-Type: text/plain; charset="iso-8859-1"

 

According to the following scenario, what should be the integer value
for the C-seq in BYE request ? 

   

  Is the C-seq value for the BYE request is correct?

   

   

  A      Proxy     B

   

  INVITE ---------->                 C-seq: 1 INVITE

  180 <--------------                   C-seq: 1 INVITE

  200 ok <---------                   C-seq: 1 INVITE

  ACK ------------->                  C-seq: 1 ACK

  BYE <------------                   C-seq: 2 BYE

  200 ok ---------->                 C-seq: 2 BYE

   

  why the c-seq value is again " 1", for ACK? 

  ACK is also an method. So, plz tell me whether C-seq value should be
"1" or "2" for ACK Method? and why?

   

   

  Thanks,

  - Shakthi

   

 



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