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SIP Handbook - Services, Technologies and Security of Session - Initiation Protocal, Syed A. Ahson and Mohammad Ilyas

Session Initiation Protocol (SIP) is among the most widely adopted protocols for IP telephony. SIP, as presented by the IETF, forms a flexible, comprehensive signaling solution and allows for a lightweight deployment of many, but not all, of the well-known service features. The simpler implementation and open collaboration of SIP make it the signaling protocol of choice for advanced multimedia communications signaling.
Computer Science & IT