14 Oct
2009
14 Oct
'09
6:56 p.m.
I'm having a similar problem at the moment;
In my setup, I have two physical interfaces, one private and one
public. As with you, I have managed to get SIP flowing without
problems with the correct IP headers re-written.
With the RTP, I've been struggling. I've been where you are at now,
but currently, through fix_nated_sdp and rtpproxy_offer I've managed
to get the correct IP addresses in the SDP header; thus I have
incoming RTP from both sides to the correct respective IP addresses of
kamailio. That is, the private one sends to the private IP address,
and the public one sends to the public IP address.
Kamailio, however, doesn't do anything with these packages. It gives
no reply about ICMP port unreachable, nor does it forward it. So,
packets are streaming in to kamailio/rtpproxy from both ends, but
nothing is coming out on either end.
I have RTP proxy running in bridged mode, with the flag -l
ext.ip.address/int.ip.address.
As with Joe, I'd appreciate any pointers.
Best regards,
Örn
On Tue, Oct 13, 2009 at 10:12 PM, Joe Hart <jhart(a)evaristesys.com> wrote:
Hi all,
For a project on which I'm currently working, I am having some problems
figuring out how to correctly configure Kamailio to communicate with RTP
Proxy in order to send media into and out of a network with private IP
address ranges.
I have a proxy set up to send the SIP traffic, and all of this is working
fine. However, I'm having some trouble getting the RTP Proxy set up.
Currently, when the call is connected, the offer/answer is made and RTP
Proxy seems to be taking over, but I'm having trouble getting my audio to
flow in both directions.
Examination of the traffic coming into and out of this machine seems to
indicate that the IP addresses aren't being mangled correctly. Specifically,
it appears the internal IP address isn't being changed to reflect the IP
address of the machine on which RTP Proxy is running, so that when the
caller tries to send audio back, the IP it's given to reply to is 10.10.x.x,
which obviously won't work.
I have tried experimenting with specifically setting IP addresses in the
rtpproxy_offer() and _answer() methods to no avail, as well as setting
various flags in those methods. However, I must admit that I'm not entirely
sure what's happening under the hood with these methods, or what rtpproxy is
doing with that information when it gets it. Rather than continue to hack
at this by trial and error, I'm hoping someone here can point me in the
right direction.
Any advice, example code or pep talks would be greatly appreciated.
Thanks in advance,
--
Joe Hart
Voice Systems Integrator
Evariste Systems
Web : http://www.evaristesys.com/
Tel : (+1) (678) 954-0670
Direct : (+1) (678) 954-0673
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