[SIPForum-discussion] Why CANCEL cannot be in Same trasaction like ACK for Non 2xx response

[Abhisek Acharya]

Vijay,

We identify transactions from branch-ids and CANCEL also has the same
branch id as INVITE ...So theoretically it should be part of the INVITE
transactions.
Please correct me if I am wrong.Also i want to see the segment where it
says that CANCEL is a different transaction in RFC 3261.Please let me know
the excat segment.

Abhisek Acharya


On Thu, Jan 10, 2013 at 11:51 PM, Vijay Kumar <vj.tech776 at gmail.com> wrote:

> Hi all
> Can any one throw light on this please.
>
> Agreed that as per 3261 INVITE and ACK for 2xx response are in
> different transaction
> Agreed that ACK for NON 2xx response and INVITE are in same transaction
>
> Same Via branch as INVITE,Same Cseq(Only Numeric part Cseq=1 ACK)  in ACK
> for NON 2xx response .(Hence ACK is for Non 2xx reponse if in same
> transaction as of INVITE)
>
> BUT
> Why not CANCEL be in same transaction as INVITE because of
> Same Via branch,Same Cseq(Only Numeric part like Cseq= 1 CANCEL)
>
> (Agreed RFC 3261 says CANCEL and INVITE are different transactions)
> Thanks in advance
> Vijay
>
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