(Answer) (Category) SIP FAQ : (Category) SIP Protocol Operation :
If I get a new SDP body in the ACK, and I don't like the media type, how can I indicate its unacceptable to me?
It doesn't work that way. You should not get a "new" SDP in the ACK. SDP goes in ACK only if there was no SDP in INVITE, then SDP was included in the 200 OK. This SDP should represent a subset of the media "offered" in the 200 OK. In other words, a normal SIP transaction has one SDP in the INVITE, and another in 200 OK. Now, we have the same two phase process, but the first SDP is in the 200 OK, and the second in the ACK.
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jdrosen@dynamicsoft.com
2000-Jul-11 4:16pm
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