Thanks Satya
-----Original Message----- From: Satyakumar [mailto:[email protected]] Sent: Wednesday, March 24, 2010 11:05 AM To: Manoj Priyankara [TG]; [email protected] Subject: Re: [Sip-implementors] different use of SIP INVITE message Hi, The SDP is different, for voice (call) and data (fax) cases. For voice the media type "audio/video", media transport protocol "RTP". Where as for T38 fax-relay the media type "image" and the transport protocol will be "udptl". The "c" line ("0.0.0.0" and session/media-attribute "a" (sendonly/recvonly/inactive) lines are different for the call hold/transfer and a normal call. Regards, Satya ----- Original Message ----- From: "Manoj Priyankara [TG]" <[email protected]> To: <[email protected]> Sent: Tuesday, March 23, 2010 10:00 PM Subject: [Sip-implementors] different use of SIP INVITE message > Dear All, > > What is the difference between the INVITE message used for call features > (such as Call hold, transfer etc) and the INVITE message used for codec > negotiation ( such as T.38 fax relay) ? > > Thanks > BR, > Manoj > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
