problem with obi100 and pap2

[gott1982]

I have a weird problem. I have (1) obi100 with a voip provider and (1) pap2 with another provider. They are both behind the same router (d-link wbr-1310). I had no problems to make them work properly in the last few days but since today some of my incoming calls from my pap2 ring on obi100 (both are on different voip providers) . I have no call forwarding enabled on my pap2. I wonder if it could be a network problem.

[RonR]

Assuming the OBi's SP1/SP2 X_UserAgentPort's are at the default values (5060/5061), do you have the PAP2 configured for different Line 1/2 SIP Ports (5062/5063), with port forwarding set in the router for each range?  It's usually a good idea to forward the RTP Port ranges also.