Patent ID: 6829249
Filing Date: 2004-12-07
Classification: H04L,H04M

Abstract:
A system for adapting a pulse code modulation (PCM) telephone system having a PBX with a back plane bus to transport information to and from a local area network (LAN) including in combination:an Internet protocol card (IPC) coupled to the back plane bus of a digital PBX system as a drop-in replacement for an existing digital key set card for permitting communications with a LAN-based device, the IPC comprising: a) a plurality of digital signal processors (DSPs) for compressing PCM voice data to packetized Internet protocol (IP) voice data and for receiving packetized IP voice data and converting it to PCM voice data; b) a digital cross point switch coupled in parallel with the DSPs and with the PBX back plane for routing PCM voice data to and from the DSPs and the PBX back plane; c) a port coupled with the LAN; d) a controller interconnecting selected DSPs with the LAN port for communicating packetized IP voice data on the LAN to and from the DSPs.