Session Initiation Protocol is a signaling protocol for Internet conferencing, telephony, presence, events notification and instant messaging. The protocol initiates call setup, routing ...

So the race was on to create a new signaling protocol. Some of these protocol specifications were open for everyone to implement, and others were vendor-proprietary solutions.

IP Broadcasting and Session Initiation Protocol Jun 1, 2008 12:00 PM, By Glenn Davies Broadcasting over IP is rapidly becoming the paradigm by which broadcasters are planning future broadcast network ...

Further, though SS7 is a simple signaling protocol as well, it doesn't have the level of expressiveness and flexibility as a text-based protocol like HTTP or SIP.

Emmanuel Proulx is a SIP (Session Initiation Protocol) developer who has written an excellent tutorial on the signaling protocol that is widely used in VoIP to initiate communications sessions ...

The protocol supports such features as conference calling, call waiting and call transfer. The primary IP telephony signaling protocols are H.323, SIP and MGCP/MEGACO.

The latest PBXes support SIP, a signaling protocol designed to span IP-based phones, software clients and other components of unified communications systems.

Secure SIP protects VoIP traffic By Michael Ward Session Initiation Protocol has become the call control protocol of choice for VoIP networks because of its open and extensible nature.

H.245 is part of the H.323 protocol suite. is the default protocol used on VoIP dial-peers. SIP Notify is only used in the SIP signaling protocol.

SIMPLE backers extol the broad media possibilities of a SIP-based signaling protocol with natural affinities for voice, video, and conferencing.