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determine the RTP port on the gridborg system and so cannot pass the
audio back, but I've been staring at the signalling all day long and I
just can't work out why not. I have several other systems doing this
(gridborg -> OpenSIPS+MediaProxy) without issue, AND if I use
something more conventional (Asterisk) it seems to work just fine,
although this may be a false symptom.

I could really, really use some help. I've included everything I could
think of trapping, if you think I should find something else, let me
know and I'll reproduce.

10.10.101.101 is the gridborg system,
100.100.100.100 is the public IP of the OpenSIPS+MediaProxy server,
200.200.200.200 is the public IP of the client system.
We're sending the call to (123) 456-7890.
(Obviously I've audited the trace/configs to put these addresses in,
but that's the only editing)

OpenSIPS config:
http://pastebin.com/YvRyuJjZ

MediaProxy config:
http://pastebin.com/QjYUzJpp

SIP trace:
http://pastebin.com/d1f9MxPA

MediaProxy debug:
http://pastebin.com/PLGNhnR9

My deepest thanks to anyone who can shed light on this;

 - Jock