SDP can be passed in any 18x response, including 180. But why would you want to do that? Don't confuse 180 and 183. If you know the line is busy use 180, than there is no reason for SDP. If you are not sure what is going on, but know there is some progress than use 183 with SDP.
Alex Zolotar Pingtel Corp. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Jasson Casey Sent: Wednesday, December 17, 2003 10:31 AM To: [EMAIL PROTECTED] Subject: [Sip-implementors] SDP in 180 response I was wondering if there explicit guidelines on whether a SDP can be passed in 180 responses? The only thing I came up with was: 21.1.2 180 Ringing The UA receiving the INVITE is trying to alert the user. This response MAY be used to initiate local ringback. 21.1.5 183 Session Progress The 183 (Session Progress) response is used to convey information about the progress of the call that is not otherwise classified. The Reason-Phrase, header fields, or message body MAY be used to convey more details about the call progress. There is no reference to body content in the 180 response, while there is in the 183 response. Some thoughts would be helpful. thanks, -jasson _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [EMAIL PROTECTED] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
