[OpenSIPS-Users] One way audio - media port changed (opensips / mediaproxy)

[Magnus Burman]

Now I see what you're saying. I thought mediaproxy used the wrong port in
the re-invite, while it is in fact not engaged at all and thus the original
IP and port is sent on. That makes a lot of sense, thank you.

According to the docs the engage_media_proxy should only be called once on
the initial invite thou and after that use the dialog module to trace the
dialog. Any suggestions as how to debug where it fails? I'm not getting any
output in the syslog.

Cheers,
Magnus

2010/2/3 Iñaki Baz Castillo <ibc at aliax.net>

> El Miércoles, 3 de Febrero de 2010, Magnus Burman escribió:
> > None of my users are behind NAT, they're all on public IPs (I control
> their
> > connection).
>
> It could occur that the gateway just allows RTP from certains IP's.
>
>
> > Sorry if it's a stupid question, but what do you mean with "the SDP is
> not
> > modified by mediaproxy"?
>
> Do you know how MediaProxy works by replacing the media IP in the SDP of
> INVITE and responses? Take a look to the first (initial) INVITE. The INVITE
> arrives to OpenSIPS with a media address XX.XX.XX.XX in the SDP, but when
> it
> leaves the proxy to go to the gateway the media is different because
> opensips
> has modified it to make it going through the MediaProxy server.
>
> But this doesn't occur for the re-INVITE as you can see in your trace.
>
>
> > On line 276 in the re-invite (Opensips --> UA) the port used is
> different:
> > m=audio 40518 RTP/AVP 18 8 0 101'
> > The original invite (line 73) reads: m=audio 58928 RTP/AVP 18 8 0 101'
>
> Not just the port but also the SDP. And this occurs because the explained
> above: opensips is not replacing the ip:port in the SDP for the re-INVITE
> and
> its response. You should check why not.
>
> However I don't know mediaproxy module functions very well so I don't know
> what "engage_mediaproxy" should do. I just can tell you what is happening
> in
> the trace.
>
>
> --
> Iñaki Baz Castillo <ibc at aliax.net>
>
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