ADTRAN has a solution for that called the NetVanta BCS, it also offer Unified Messaging, Fax Server, Database Integration and Conference Bridge.
It can easily be installed on the NetVanta 420e Server:
Call our free Applications Engineering Team for more information and a free quote!
Let me know if you have any questions.
Thank you for the information but BCS is going to be overkill for this client as the only feature they are looking to add to their Netvanta is click to dial.