Voice and Internet Multimedia in UMTS Networks
BT Technology Journal
Bearer-Independent Call Control
BT Technology Journal
H.323 — A Key to the Multimedia Future
BT Technology Journal
RIDE Replacement — A Hybrid PSTN/VoIP Application Solution
BT Technology Journal
VoIP Applied — Lab Bench to Multimedia Service
BT Technology Journal
International Standards for VoIP
BT Technology Journal
Bearer-Independent Call Control
BT Technology Journal
SIP and H.323 — Interworking VoIP Networks
BT Technology Journal
IP Telephony Solutions for the Customer Premises
BT Technology Journal
BT Technology Journal
Evolving Systems Beyond 3G — the IST BRAIN and MIND Projects
BT Technology Journal
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The session initiation protocol (SIP) is an IETF application-layer control (signalling) protocol for creating, modifying and terminating sessions with one or more participants. SIP is a simple, scalable, text-based protocol that offers a number of benefits, including extensibility, the provision of call/session control, and inherent user mobility. BT's experimental version also offers well-defined APIs, allowing it to be easily integrated into Web and other IP-based applications. SIP can also carry different session description protocols and may also be extended to support PSTN transit via encapsulation of SS7 ISUP (SIP-T). SIP is expected to become widely available in 2001, gradually replacing H.323 as the protocol of choice for multimedia session control in IP networks. This paper describes the operation of SIP, details why it is important to BT and looks at the roles that SIP might play in a future all-IP fixed and mobile converged network. Finally, the paper also describes an experimental SIP-based virtual home environment (VHE) providing personal mobility.