Patent ID: 7406097

Claim:
A system for accomplishing a handoff, comprising: a first mobile communication system; a second mobile communication system; and a gateway, connected with each of the first and second mobile communication systems, to perform a protocol conversion and an address mapping for handing off a call between the first and second mobile communication systems, wherein the protocol conversion performed by the gateway includes converting packets of a first type to packets of a second type, with one of said first or second type of packets corresponding to an asynchronous transfer mode (ATM) packet and the other of said first or second type of packets corresponding to an inter processor communication (IPC) packet, wherein the address mapping performed by the gateway includes mapping at least one type of message between the first and second mobile communication systems, and wherein one or more packets of the first type include a data frame transmitted to the gateway from the first mobile communication system, the data frame comprising an inter processor communication header and inter processor communication data, the inter processor communication data including at least a source address, a target address, a source task identifier (ID), and a target task ID.