Your issue is resolved, but I think it worth noting for others that visit this thread, that it is common to have one-way audio problems with IP communicator and older or non-cisco VPN clients that don't mimic an additional network adapter. In this scenario, you have to run the IP Communicator admin tool on the CM Publisher and update the paramaters for the IPC device to reflect the location of the getip.asp which is installed as part of the IPC admin tool.
John Lever
Telecommunications
Richland School District Two