How to set up Vonage® to work as a PBX
There are two basic methods...
One is with a virtual service hosted by a service provider such as iTeleCenter™ which includes unlimited calls and a Toll-Free main number to your custom Virtual PBX menu.
Another method is with your own PBX equipment in-house. But you need to be careful with this as some PBX's are not compatible with all VoIP adapters.
One such PBX is the VoicePro, a low-cost Small Business Telephone System which includes an Auto Attendant, VoiceMail with 99 mailboxes, and a PBX with up to 12 in-house extensions.
We tested the VoicePro on the Vonage Network and we have found no problems when using the Vonage® V-Portal™ Phone Adapter (Model VDV21-VD).
When using an in-house PBX such as the VoicePro you can program it to transfer incomming calls to a cell phone or any other number by using the standard hook-flash feature supported with Vonage.
In order to free up the line after transferring a caller, the PBX should be programmed to hook-flash and dial #90 followed by the destination number, then another #. Then go back on-hook so the line is free for the next incoming call. When programming the VoicePro, use the Centrex method for call transferring and include the #90 in the dialing string.