Hi, Thanks for your response. but RFC 2327 Grammar says like media-field = "m=" media space port ["/" integer] space proto 1*(space fmt) CRLF
media = 1*(alpha-numeric) ;typically "audio", "video", "application" ;or "data" Which means, one or more m line is mandatory rite. please correct me, if i am wrong. Regards, vijay --- On Tue, 21/4/09, karthik karthik <[email protected]> wrote: From: karthik karthik <[email protected]> Subject: Re: [Sip-implementors] media line (m line) is mandatory in SDP? To: [email protected] Cc: "sip fourm" <[email protected]> Date: Tuesday, 21 April, 2009, 7:36 PM Hi, Hope this thread has more info about this topic https://lists.cs.columbia.edu/pipermail/sip-implementors/2008-October/020798.html Karthik On Tue, Apr 21, 2009 at 7:31 PM, Frank Shearar <[email protected]> wrote: friend friend wrote: > Dear Friends, > In SDP, media (m line) is mandatory? if so, if the UAC doesnt support > video, audio, can the UAC send SDP like m: 0(zero)? > > Please clarify. > The m header is not mandatory. RFC 4566 section 5 says An SDP session description consists of a session-level section followed by zero or more media-level sections. If the UAC supports no kinds of media it'll send no media-level sections. Not very _useful_, since the UAS must respond with the same number of media-level sections! frank _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors Cricket on your mind? Visit the ultimate cricket website. Enter http://beta.cricket.yahoo.com _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
