The Session Initiation Protocol (SIP) is an IETF-defined signaling protocol, widely used for controlling multimedia communication sessions such as voice and video calls over Internet Protocol (IP). The protocol can be used for creating, modifying and terminating two-party (unicast) or multiparty (multicast) sessions consisting of one or several media streams. The modification can involve changing addresses or ports, inviting more participants, and adding or deleting media streams. Other feasible application examples include video conferencing, streaming multimedia distribution, instant messaging, presence information, file transfer and online games. This book is your ultimate resource for Session Initiation Protocol. Here you will find the most up-to-date information, analysis, background and everything you need to know. In easy to read chapters, with extensive references and links to get you to know all there is to know about Session Initiation Protocol right away, covering: Session Initiation Protocol, Authenticated Identity Body, Call Admission Control, Distributed Universal Number Discovery, H.248, H.323, Hookflash, Inter-Asterisk eXchange, IpTTY, Jingle (protocol), List of SIP request methods, List of SIP response codes, Media Gateway Control Protocol, Media Gateway Control Protocol (Megaco), Media Gateway Control Protocol (MGCP), Message Session Relay Protocol, MiNET, Network Voice Protocol, Network-based Call Signaling, Open Phone Abstraction Library, Open Settlement Protocol, Real-time Transport Protocol, Registration, Admission and Status, RTP audio video profile, Signaling Compression, Simple Gateway Control Protocol, SIP Trunking, Skinny Call Control Protocol, Skype protocol, T.37 ITU-T recommendation, T.38 ITU-T recommendation, UNIStim, Anti-tromboning, Back-to-back user agent, Call Agent, Call origination, Chatter bug, Comfort noise, Host Media Processing, International gateway, Internet telephony service provider, IP Multimedia Subsystem, Lawful interception, Mouth-to-ear delay, Multimedia Telephony, Origination, Packet loss concealment, PacketCable, Purple minutes, Session border controller, Signaling gateway, SIP connection, Softphone, STUN, Survivable Branch Appliance, Talkspurt, Traversal Using Relay NAT, Trunking gateway, Vishing, Voice chat, Voice engine, Voice peering, VoIP spam, VoIP VPN, WebCall, White, black and grey routes, Wideband audio This book explains in-depth the real drivers and workings of Session Initiation Protocol. It reduces the risk of your technology, time and resources investment decisions by enabling you to compare your understanding of Session Initiation Protocol with the objectivity of experienced professionals.