We have a hub and three satellite Comdial phone switches with a shared voicemail system, all connected via PRI cards over point to point circuits. I believe the communication is clear channel.

I am just curious if anyone has two or more Comdial switches communicating over a PRI via MPLS and NOT a dedicated network. Our users have grown accustomed to the luxury of extension to extension dialing within the network, and having voicemail information displayed on their phone. I want to migrate to the MPLS network offered by AT&T, but there appears to be some hesitation on the part of the Telco and the switch vendor as to whether it's possible.

TIA!