Question : VOIP phones not passing voice through networks

I have a network with a point to point. The server side is 10.2 and the client side is 10.3. We have a NEC aspire phone system on the 10.2 side. We have VOIP phones on the 10.3 connecting to the server on 10.2. We are able to get data through the network but not the voice. We have a cisco 1600 running the point to point and a 3640 doing the routing. Can someone explain whats going on?

Answer : VOIP phones not passing voice through networks

blah we made a very dumb mistake and changed the ip on the 1600. Well the phone system was looking for that old ip.