[OpenSIPS-Users] packet forwarding when two mediaproxy 2.0s are back-to-back

[Iñaki Baz Castillo]

El Friday 05 September 2008 14:32:25 Juha Heinanen escribió:
> Alex Hermann writes:
>  > Shouldn't the mediaproxy just start forwarding to the addresses/ports in
>  > the SDP and update the destinations when the learned source address/port
>  > is different? Instead of trying to learn both endpoints before
>  > forwarding any traffic.
>
> that kind of strategy sounds good to me.  i don't know though, if
> mediaproxy 2.0 implementation can support (without update by control
> protocol) such dynamic change of packet destination once the flow has
> started.

AFAIK RtpProxy adds an attribute in SDP:
  a=nortpproxy:yes
so if the request arrives to other proxy using other RtpProxy, this last 
RtpProxy wouldn't wait for RTP traffic but instead start forwarding RTP to 
the address announced in the SDP (not sure anyway about it).

Of course, this solution has a problem since it's just valid when the call 
goes though various RtpProxies, but any other kind of media proxy would not 
understand that attribute.

There should be a standarized SDP attribute for this.

-- 
Iñaki Baz Castillo
ibc at in.ilimit.es