See the comments inline
Regards,
Mahipati Deshpande
----- Original Message ----
From: Tang Xi <[EMAIL PROTECTED]>
To: sip-implementors <sip-implementors@cs.columbia.edu>
Sent: Monday, 23 October, 2006 7:07:52 AM
Subject: [Sip-implementors] Query for Offer/Answer
Hi
1>if INVITE has an offer, but the 200 reponse doesn't have an answer (there
is not any 18x reponse between them)
what shall I do? Can send back the ACKwithout SDP, and immediately send
BYE?
[DESH] SIP offer/answer model clearly mentioned that 200 OK for INVITE must
have answer if
INVITE had an offer and must contain offer if INVITE does not have an offer.
ACK must have an answer if UAC does not issue an offer in INVITE. Your question
voilates this law. In this scenario you can send BYE immediately after ACK. Or
you can ignore 200 OK (as some implementation does this), so that UAS times out
and drops the call.
2>if INVITE hasn't an offer, but the 200 reponse doesn't have an offer
yet(there is not any 18x reponse between them)
Can send back the ACK without SDP, and immediately send BYE with Warning:
"no SDP in 200 OK responses" header?
[DESH] Here also you can send BYE immediatly after sending ACk, or can ignore
200 OK.
Would appreciate your response.
Thanks
Xi Tang
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