2009/8/31 Kaustubh Madhav PATWARDHAN <kaustubh.patward...@st.com>: > I am developing a fax gateway application using the Sofia SIP. > > Following is the sequence of SIP messages happening in that order between > Calling and Called Gateways > > Both the gateways are running Sofia SIP > > Calling Gateay Called Gateway > > 1) INVITE (audio 9000 RTP..) -----> 2) 200 OK (audio 9000 RTP...) > | > | > \/ > 4) 200 OK (image 0 UDPTL t38) <----- 3) INVITE (image 9000 UDPTL t38) > > When the Called Gateway sends the second INVITE for fax data, the Calling > Gateway sends 200 OK, with image port set to 0. Then sending of fax data > fails. I do not know, why the 200 OK should send image with port set to 0 ? > Could you please provide your valuable insight and expert advice on this?
You should probably replace your user SDP with m=image line when responding to 2nd INVITE? If your user SDP does not have m=image line, then the explanation is simple, m=image 0 means that the proposed fax transmission media in 2nd INVITE got rejected. If you do have m=image line, then you have two options: * use SOATAG_ORDERED_USER(1) and include only m=image line in user SDP * use SOATAG_ORDERED_USER(0) (default) and include m=audio and m=image lines in user SDP Or then there might be a bug, so an example of the your session including the SDPs sent in all 4 messages along with debugging output with env variables NUA_DEBUG=9 SOA_DEBUG=9 would be very helpful... -- Pekka.Pessi mail at nokia.com ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Sofia-sip-devel mailing list Sofia-sip-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sofia-sip-devel
