I've moved into a new management position and one of the immediate projects is upgrading an existing digital phone system, Avaya IP Office over 2 MPLS circuits to two remote offices to an Avaya IP 500 using the same MPLS circuits. The new system, chosen before I started, is IP and I'm wondering if the existing MPLS circuits are the best choice. There are 3 office locations as follows: 1 with about 50 phones, a second with about 30 phones, and the third with about 20. Phone taffic is running on seperate connections from data.
Is there another connection method, perhaps using a vpn connection across a business class cable connection a better option? I have little knowledge of MPLS besides knowing what the acronym stands for. I do understand that QoS is a need for IP phone systems.
Any insight, direction, and/or shared knowledge and experience would be appreciated.