Dear experts, I have a question regarding SDP in a 183 Session progress response in case of SIP-ISUP interworking (rfc3398).
rfc3398 states: ... the gateway will generate a 183 message towards the SIP node; this contains SDP to establish early media cut-through. But it is my understanding of offer/answer model that no SDP in a response (answer) is necessary to cut-through in backward direction because the SDP in INVITE (offer) already contains all information to send media to the caller. If an SDP is necessary in a 183 message in the above mentioned case: What should it contain? Thanks for you help. Franz _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
