[OpenSER-Users] SIP Trunk doesn't response to 200OK with an ACK

Robert Dyck rob.dyck at telus.net
Sun Feb 17 19:26:17 CET 2008


We can only guess about the topology. My guess is that here is a router with a 
public address and that the node that is hosting openser does not have an 
interface on the public network. The router could be using port forwarding or 
it could be a NAT binding. Then it would _appear_ as if the message went 
directly from the public network to 192.168.2.10:5060 depending on your point 
of observation.

For INVITE we rely on the registrar for the public address. For ACK we rely on 
the RR list.



On Sunday 17 February 2008, Iñaki Baz Castillo wrote:
> El Domingo, 17 de Febrero de 2008, Robert Dyck escribió:
> > In 200 OK there is no public address in the Recorde-Route list.
>
> It shouldn't be a problem since the gateway seems to have an interface to
> that private network. In fact, note that the first INVITE from gateway goes
> to the private address of OpenSer:
>
> U 8.21.8.24:5060 -> 192.168.2.10:5060
> INVITE sip:1001 at 2.6.7.9 SIP/2.0.
> Via: SIP/2.0/UDP 8.21.8.24:5060;branch=z9hG4bK69c359bd;rport.
> From: "19195551212" <sip:19195551212 at 8.21.8.24>;tag=as6869d7f8.
> To: <sip:1001 at 2.6.7.9>.
> Contact: <sip:19195551212 at 8.21.8.24>.






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