Hi, i have few queries on SIP offer/answer for which I couldn't find a straightforward answers:
1. We all are aware that we should be prepared to receive initial INVITE with no offer. In this case, the UAS is supposed to send its offer in the 200 Ok response. Is sending re-INVITE with no SDP valid case? I know sending UPDATE with no SDP is valid. 2. Once a unicast session is established, can any of the party send a new offer with entirely new "o" line?. The motivation for asking this question is that suppose I have a B2BUA who doesn't do much on SDP part and simply copies SDP from incoming messages to the outgoing messages. Now if this B2BUA wants to send re-INVITE (for hold or inactive media) to either party, does it needs to remember previous SDP negiotiation and modifies that SDP to send re-INVITE or can it create a SDP without considering anything form previous offer/answer. Thanks, ~Vikram _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
