Matrix values the investment of a customer in VoIP systems. Hence, we have initiated the Interoperability program to identify and certify various open standard SIP based product manufacturers. These SIP based product determines the compatibility through rigorous testing with Matrix VoIP platforms. The main objective of this extensive interoperability program is that it broadens the customer’s choice where he/she is able to select compatible VoIP terminals and gateways from a pool of third-party manufacturers.