[Kamailio-Users] Media Bridge tips and hints

[Klaus Darilion]

Am 22.03.2010 21:00, schrieb Uriel Rozenbaum:
> Hi gentlemen,
>
> I'm having a bit of a hard time developing a bridge for media sessions.
>
> I have a box with 2 interfaces; eth0 has the private IP p.r.i.v and eth1
> has public IP p.u.b.l.
>
> When I receive a message in the private IP I try sending the call to a
> public proxy we have (p.u.b.2) using Carrierroute module but the source
> IP used is p.r.i.v. It is obvious that p.u.b.2 will not be able to route
> back messages.
>
> #
> U 192.168.200.11:5060 <http://192.168.200.11:5060> -> p.r.i.v:5060
> INVITE sip:1568767139 at p.r.i.v SIP/2.0.
> Via: SIP/2.0/UDP 192.168.200.11:5060;branch=z9hG4bK5d94bc09.
> From: "60911000" <sip:60911000 at p.r.i.v>;tag=as6d477d46.
> To: <sip:1568767139 at p.r.i.v>.
> Contact: <sip:60911000 at 192.168.200.11
> <mailto:sip%3A60911000 at 192.168.200.11>>.
> ...
>
> #
> U p.r.i.v:5060 -> p.u.b.2:5060
> INVITE sip:1568767139 at p.u.b.2 SIP/2.0.
> Record-Route: <sip:p.r.i.v;lr=on;ftag=as6d477d46>.
> Via: SIP/2.0/UDP p.r.i.v;branch=z9hG4bKf531.440788e1.0.
> Via: SIP/2.0/UDP
> 192.168.200.11:5060;rport=5060;received=192.168.200.11;branch=z9hG4bK5d94bc09.
> From: "60911000" <sip:60911000 at p.r.i.v>;tag=as6d477d46.
> To: <sip:1568767139 at p.r.i.v>.
> Contact: <sip:60911000 at 192.168.200.11
> <mailto:sip%3A60911000 at 192.168.200.11>>.
> ...
>
> I try then to set listen=0.0.0.0 so kamailio will be binded to all IPs
> but then the Route headers and Via use this 0.0.0.0

This is really weird.

Usually you configure each interface separately. Then Kamailio should 
choose the proper IP address in Via and RR headers:

listen=udp:p.r.i.v:5060
listen=udp:p.u.b.2:5060

regards
klaus


>
> #
> U 192.168.200.11:5060 <http://192.168.200.11:5060> -> p.r.i.v:5060
> INVITE sip:1568767139 at p.r.i.v SIP/2.0.
> Via: SIP/2.0/UDP 192.168.200.11:5060;branch=z9hG4bK14a00df7.
> From: "60911000" <sip:60911000 at p.r.i.v>;tag=as502405cf.
> To: <sip:1568767139 at p.r.i.v>.
> Contact: <sip:60911000 at 192.168.200.11
> <mailto:sip%3A60911000 at 192.168.200.11>>.
> ...
>
> #
> U p.u.b.l:5060 -> p.u.b.2:5060
> INVITE sip:1568767139 at p.u.b.2 SIP/2.0.
> Record-Route: <sip:0.0.0.0;lr=on;ftag=as502405cf>.
> Via: SIP/2.0/UDP 0.0.0.0;branch=z9hG4bK711b.8d28549.0.
> Via: SIP/2.0/UDP
> 192.168.200.11:5060;rport=5060;received=192.168.200.11;branch=z9hG4bK14a00df7.
> From: "60911000" <sip:60911000 at p.r.i.v>;tag=as502405cf.
> To: <sip:1568767139 at p.r.i.v>.
> Contact: <sip:60911000 at 192.168.200.11
> <mailto:sip%3A60911000 at 192.168.200.11>>.
> ...
>
> In this case the destination UA cannot return the call because it does
> not have a valid IP to do so.
>
> Is there any way to make Kamailio act in a different way? Like letting
> me modify the IP it will use for Via and Record-Route headers. Be aware
> that I'm supposed to do some kind of mirror for calls coming from
> outside the network (origin is public and destination is private).
>
> I'm sure I'll be asking some more on this same thread as I test.
>
> Thanks in advance!
> Uriel
>
>
>
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