OKay here's the situation. I have a Cisco VOIP 7960 series phone. I have an RCA DCM425 Cable modem with service through Time Warner Cable. I also have a Belkin FSD5231-4 Router. The VOIP service is through Pingtone. The phone was programed by my boss (computer science degree). When I dial someone from the phone, As soon as I connect to the person on the other end, I cannot hear anything. But they can hear me when I speak through the mouth piece. When they call me, the phone will ring. But again, the same thing happens. The can hear me but I cannot hear them. Too make sure the phone was not defective, I sent this phone back to my boss and they ordered a new phone direct from the seller. So, this is the second phone and the same thing happened. I disconnected the phone from my router and plugged it directly into my modem. The phone could not Configure to Pingtone. I plugged it into my Belkin Router and it connects to Pingtone in 5 minutes. Please help me resolve this situation.
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Pingtone appears to be a hosted Cisco VOIP service. Have you tried contacting their support (http://www.pingtone.com/customer/index.html)? I hope they've dealt with customers with Cisco VOIP phones behind home routers before.
Until you mentioned that you already putting the phone in front of the router, I assumed the problem was with a required range of UDP ports for talkpath not being left wide-open on your router. I believe in idle mode, your phone initiates and maintains a connection on TCP port 1719 or 1720 to the Cisco Callmanager at Pingtone. While dialing and ringing, you are still only talking to the Callmanager. After answering a ringing phone, you establish a peer-to-peer connection between your phone and the remote phone on a range of UDP ports (not fixed, in most cases) - one set for outgoing voice from you to remote, and another set for incoming voice from the remote to you. This means your router must allow some range of UDP ports from anywhere to come in and be forwarded to your phone.
When you disconnected the router and attached the phone, did you also power-cycle your cable modem? In my experience with Comcast, cable internet systems only allow a single hardware (MAC) address to be connected at a time to a cable modem. They require some time or a swift kick (reboot) to recognize a new hardware address being attached. If that doesn't work, verify that Time Warner allows you to change devices without needing to contact them. In the bad old days of cable internet service, you had to register your hardware address with the cable vendor. If you changed your PC or router, you had to contact them to allow the new MAC address.