Patent ID: 7526563

Claim:
An interworking gateway for interworking at least one Open Mobile Alliance (OMA) Instant Message and Presence Service (IMPS) domain and a Session Initiation Protocol (SIP) infrastructure comprising at least one SIP Instant Messaging and Presence Leveraging Extensions (SIMPLE) domain, the gateway comprising: an OMA IMPS interface for communication with the at least one OMA IMPS domain; a SIMPLE interface for communication with the SIP infrastructure; and an interworking function linking said interfaces and comprising a transaction mapping module for converting an interworking subset of OMA IMPS transactions received by said OMA IMPS interface to corresponding SIMPLE transactions and relaying said corresponding SIMPLE transactions to said SIMPLE interface for transfer to the SIP infrastructure, and for mapping an interworking subset of SIMPLE transactions received by said SIMPLE interface to corresponding OMA IMPS transactions and relaying said corresponding OMA IMPS transactions to said OMA IMPS interface for transfer to the at least one OMA IMPS domain.