Abstract
The telephony network is evolving to an all Internet Protocol (IP)-based network. The 3rd Generation Partnership Project (3GPP) and 3rd Generation Partnership Project 2 (3GPP2) standards organizations are currently defining the network architecture for the next generation IP Multimedia Subsystem (IMS) network, which is being applied to multiple access technologies and networks, including the next-generation network (NGN). Concurrently, an effort lead by International Telecommunications Union Telecommunications standardization sector study group 13 (ITU-T SG 13), and presently carried in the focus group on NGN, is adopting IMS for wireline networks. The European Telecommunications Standards Institute's (ETSI) Telecommunication and Internet converged Services and Protocols for Advanced Networks (TISPAN) group is also developing NGN specifications. An essential part of the next-generation network is the seamless interaction with the existing telephony network, enabled by interworking between integrated services digital network user part (ISUP) in the public switched telephone network (PSTN) and Session Initiation Protocol (SIP) in the IMS. Several SIP profiles have been defined in the Internet Engineering Task Force (IETF) and ITU-T for specific interworking applications. SIP is a very flexible protocol with numerous options and extensions. A SIP profile is a specific combination of options and extensions as used by an application. No profile currently supports the interworking of all existing services between SIP networks. This paper analyzes existing SIP profiles against requirements for interworking between different networks and identifies the main SIP profile characteristics necessary to effectively interoperate between multiple networks while maintaining existing services. Two SIP profiles used in ITU-T discussions — IMS SIP and SIP with encapsulated ISUP (SIP-I) — are highlighted to explain ISUP signaling situations. Requirements for a common SIP profile are then described as they relate to these two profiles.
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