[OpenSIPS-Users] Music on hold, sdp 0.0.0.0.

[Miha]

Dne 6/20/2013 8:32 AM, piše Miha:
> Hi,
>
> I need one info regarding puting user on hold.
>
> A calls B, B puts A on hold and do 2-transfer to C. After C answers it 
> puts A and C together.
>
> A is on our side, using opensips and FS for media gw, B and C on other 
> side using netcetrex softswitch.
>
> A sends invite with SDP to B, B sends OK, and send reinvite with SDP 
> c=0.0.0.0. which is ok, A sends ok and music is heard by A, after B 
> trasfer call to C and C pickup call, A gets invite buth with no SDP. 
> is this ok? I guess it should sends invite with sdp which has IP for 
> sending RTP. This results that A and B can not hear each other.
>
> Other side is saying that with other voip providers this works ok.
>
> thanks!
>
> Miha
>
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I also noticed one thing. After they send invite without SDP, we sends 
SDP 200 ok and they send back ACK SDP in which they send c=IP. According 
to RFC this is right way.
What I am missing here.

thanks!

miha