My Client has just aquired a 3 branch company who currently has 3 Intertel Axxess connected together via PP T-1s. They also have a complete spare system which they would like to move to their HQ location to provide connectivity to the Tadiran PBX via direct T-1/E&M. The connection will be provided over AT&Ts MPLS EVPN network, so a Cisco Router at each end will provide the T-1 connection. I understand that Inter-Tel uses a proprietary PRI D channel format to connect two systems via T-1, so the Cisco Routers will not support the proprietary D Channel.

Any suggestions?