Olle E. Johansson wrote: > 20 mar 2010 kl. 15.50 skrev Iñaki Baz Castillo: > >> 2010/3/20 Pranab Bohra <pranab.bo...@gmail.com>: >>> As per section 2.1 of rfc 3666, the softphone should open the rtp port >>> to receive early media when the gateway responds with 183 + SDP. >> The problem is that some servers/gateways send first a 183 with SDP. >> The UAC receives the early media. But after a second (or less) the >> server sends a 180 and *stops* the RTP. > I guess that you mean an 180 without SDP.
Receiving SDP has nothing to do with opening your audio port. The UAS could be sending audio even though it has not yet sent an answer. >> If the UAC chooses to render the real audio (183) rather than the >> artificial ringing (180) then there will be no audio anymore (until >> the 200 arrive of course). >> This occurs with some phones and some servers. >> > Yep. > > /O > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
