IP PBX VoIP Interoperability Initiative

A number of leading IP telephony vendors, including Avaya, BroadSoft, Cbeyond, Centrepoint Technologies, Cisco Systems, and Mitel, have developed a draft best practices document to guide interoperability between IP PBXs and VoIP service provider networks. The newly released, publicly available SIPconnect Interface Specification leverages the existing family of Session Initiation Protocol (SIP) and other Voice over IP protocols published by the Internet Engineering Task Force (IETF).