[asterisk-users] Asterisk not receiving call from VPN address

[Larry Moore]

Have you checked your localnet=, deny=, permit=, contactdeny= & 
contactpermit= settings?

My 2c worth.

On 20/01/2014 10:51 AM, David Cunningham wrote:
> Hi,
>
> We have a Kamailio and Asterisk cluster, both machines being on a real
> 103.x IP address and also on a 172.x OpenVPN address.
>
> The problem is that when Kamailo receives a call from the VPN and
> forwards it to the Asterisk server on it's 103.x address, Asterisk never
> sees the call.
>
> If Kamailio receives a call from the VPN and forwards the call to the
> Asterisk server on it's 172.x address then it works. However, if the
> call isn't from the VPN then forwarding it to the 172.x address doesn't
> work. So basically the problem is going between the real network and the
> VPN.
>
> The question is, how can we make this work when calls are received on
> either network on the Kamailio server and are forwarded to Asterisk?
>
> Using ngrep on the Asterisk server we see that it does receive the
> INVITE, but Asterisk's logging shows no sign it at all. We guess it's a
> Linux networking issue rather than Asterisk's fault, but don't know
> where to fix it. We do have net.ipv4.ip_forward = 1 on both the Kamailio
> and Asterisk servers.
>
> Thanks in advance for any help.
>
> The ngrep on the Asterisk server:
>
> U 2014/01/17 13:15:15.599557 172.x.x.x:5060 -> 103.y.y.y:5060
> INVITE sip:9067268 at 103.y.y.y:5060;transport=udp SIP/2.0.
> Record-Route: <sip:172.x.x.x;lr=on>.
> Via: SIP/2.0/UDP 172.x.x.x;branch=z9hG4bK50c7.f49ceb73.0.
> Via: SIP/2.0/UDP 192.z.z.z:5062;rport=5062;branch=z9hG4bK806710997.
> From: "9067271" <sip:9067271 at 172.x.x.x>;tag=198791249.
> To: <sip:9067268 at 172.x.x.x>.
> Call-ID: 1905625787 at 192.z.z.z.
> ...
>
> 172.x.x.x is the Kamailio server's VPN address
> 103.y.y.y is the Asterisk server's real address
> 192.z.z.z is the calling phone's LAN address
>
> --
> David Cunningham, Voisonics
> http://voisonics.com/
> USA: +1 213 221 1092
> UK: +44 (0) 20 3298 1642
> Australia: +61 (0) 2 8063 9019
>
>