Semiconductors, Internet protocol private branch exchange (IPBX) telephony system comprising of computer hardware and software for routing, switching, controlling and managing voice and data traffic over packet-switched networks including local area networks (LAN), wide area networks (WAN) and global computer networks, including devices for converting analog telephone and fax terminals for use over Internet protocol (IP) gateways, which provide private branch exchange (PBX) capabilities and support for messaging functions, for use in connection and PBX-based network to an IP-based network