I have stranges problems with a 1751 router with VIC with IOS 12.2(11)T. When I try to establish a call between Netmeeting and the router, it completely fail. It's probably because of the H.323 version that is quite more recent on 12.2.
However, I have other H.323 devices that support H.323 v4. When the call is established from the PSTN to the IP phone, everything works fine. When I tried to establish the call from the IP phone out to the PSTN, I have one way audio problem. The PSTN user can't hear the IP user.
IP routing is enable, voice rtp send-rcv, h323-gateway bind src addr on a loopback... My default gateway is set, I don't understand and I also think that the TAC doesn't also. If anyone has problem, please reply I think it's a bug...