No it is not valid to send SDP in ACK as offer-answer is complete for call 
setup and any new SDP thereafter shall be treated as new offer. Unlike PRACK, 
ACK message do not have a response so it is not correct to send SDP in the ACK.
Any new offer after call setup should be made through ReINVITE or UPDATE and 
not through ACK.

Regards

Anuradha Gupta
ARICENT

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Alejandro 
Orellana
Sent: Friday, November 14, 2008 12:11 AM
To: sip-implementors@lists.cs.columbia.edu
Subject: [Sip-implementors] SDP offer/answer question

All,
in the following call flow,
is it valid for endpoint A to send a ACK with SDP?

endpointA                                                                GW
------------INVITE w/SDP (offer)-------------------------------------->
<------------100 trying-----------------------------------------------------
<---------------200 OK w/SDP (answer)------------------------------
----------------ACK w/SDP (identical to the answer) ------------>

.

thanks in advance
Alejandro
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