On Jun 27, 2013, at 9:50 AM, Johan Wilfer <li...@jttech.se> wrote:
> Hi!
>
> I've the following setup: Teleco <-> Kamailio <-> Asterisk(s)
>
> The proxy has one public IP (say 1.2.3.4) and one private (10.0.0.1).
> The asterisk-pbx:es has private adresses (10.0.0.2 in this example)
>
> I noticed that if I bind like this in kamilio.cfg
> listen=tcp:1.2.3.4:5060
> listen=udp:1.2.3.4:5060
> listen=tcp:10.0.0.1:5060
> listen=udp:10.0.0.1:5060
>
> Then if a call comes in from the Telco to Kamailio (1.2.3.4), kamailio should
> forward the SIP-packet from it's private address (10.0.0.1) to asterisk
> (10.0.0.2)
>
> However, the source address of the packets sent from Kamilio to Asterisk is
> wrong - it uses the public ip. Like this (tcpdump output):
>
> 15:02:08.999642 IP 1.2.3.4.sip > 10.0.0.1.5060: SIP, length: 1346
> 15:02:09.474525 IP 1.2.3.4.sip > 10.0.0.1.5060: SIP, length: 1346
> 15:02:10.474524 IP 1.2.3.4.sip > 10.0.0.1.5060: SIP, length: 1346
> 15:02:12.474525 IP 1.2.3.4.sip > 10.0.0.1.5060: SIP, length: 1346
>
> Obviously kamailio doesn't get any answers here. The packet goes out of the
> right interface, but with the wrong src-address.
>
> However, if I remove the lines with "listen=" in kamailio.cfg to allow
> kamilio to bind to all interfaces the src-address is correct and everything
> works!
>
> (I've also done some tests with icmp and telnet and the src-addr seems right
> in all these cases.)
>
> Is this a bug or am I missing something here?
It sounds like what you want is force_send_socket:
<http://www.kamailio.org/wiki/cookbooks/4.0.x/core#force_send_socket>
andrew
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