Abstract
H.323 is currently the industry's predominant standard for offering multimedia services over IP networks, although the session initiation protocol (SIP) continues to generate significant interest in the market-place for rendezvous-based real-time applications. With its greater maturity, H.323-based equipment continues to be deployed in operational networks. However, with the advent of SIP-based third generation mobile networks and the continued development of voice over cable TV networks based upon SIP, significant deployments of SIP-based networks are on the horizon. Interworking between SIP and H.323-based equipment is of significant importance to BT and its Joint Venture partners. This paper highlights some of the issues surrounding protocol interworking between the H.323 and SIP protocol sets.It can be shown that, while possible, interworking inevitably results in sub-optimal operation and a loss of features. Thus, as interworking is inevitably going to be required for a long time to come, and the result is less than perfect, the standards bodies should be encouraged to develop service-enabling extensions to their protocols that are compatible between both protocol suites wherever possible.
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