I am having a problem getting Avaya IP soft or hard phones working across Cisco VPN. The phones work great within the corporate network, but as soon as we add a VPN connection it fails. The Avaya solution is using H.323 for Voice and I think that is part of my problem. For info purposes we are using Avaya IP office and Avaya 4612 IP Hard Phones and the soft phone is the Phone Manager software.
I have a Cisco 3015 Concentrator running 3.6.1 at the corporate office. I have had users with laptops get the IP Soft phone working inside our network. Then when they go home, and use VPN Client 3.6 and 3.5.4 they are no longer able to use the soft phone client. Connectivity is there and was verified with pings between Phone System and client system. We have tried different VPN transports, we have tried split tunneling and have disabled all involved firewalls and it still does not work.
I have also just tried to use a VPN 3002 running 4.0.1 and an IP Hard Phone plugged into it. It has connectivity (config download via TFTP and pings are successful) but Voice does not work.
I can only get net meeting (also uses H.323) to work if we dial out from the VPN clients. Calls to the client fail. I am wondering if this also has something to do with it. Maybe some sort of "one-way" failure to establish H.323 correctly?
Has anyone seen this? Any ideas?