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

[Vijay Kumar]

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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