> Is there a way in SIP to send to a UA some > non-SIP messages tunneled within existing > SIP messages (assuming that the UA can > (and expects to) receive such non-SIP messages)?
Not officially since using sip to tunnel messages of another protocol is discouraged. > Should the OPTIONS, INFO, REFER, NOTIFY or INVITE > message be used for this purpose? It really depends on what and when you are wanting to deliver the information. The INVITE should not be used unless a real session is trying to be established; and a held call should not be established just to tunnel messages over the sip dialog. Using a SUBSCRIBE/NOTIFY, REFER, or OPTIONS mechanism can be used within or outside of a call related sip dialog. The use of INFO for any reason has mostly become discouraged. Depending on what is being tunneled, the data can be include within the body, a parameter, or a new "p-" header. New content potentially requires going through the IANA registration process to avoid naming collisions. _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
