Most standards-based solutions use either the H.323 or Session Initiation Protocol (SIP) protocols. A number of proprietary designs also exist. These typically support features such as call waiting, conference calling, and call transfer.
- Existing secure transport protocol
- Unsecure transport protocol
- New secure transport protocol proposal
- Session Initiation Protocol (SIP)
- defined by the IETF, newer than H.323
- defined by the ITU-T
- Megaco (a.k.a. H.248) and MGCP
- both media gateway control protocols
- Skinny Client Control Protocol
- proprietary protocol from Cisco
- proprietary protocol from Mitel
- proprietary protocol from Siemens
- the Inter-Asterisk eXchange protocol used by the Asterisk open source PBX server, Yate and associated client software
- a proprietary peer-to-peer protocol used in the Skype application
- a proprietary peer-to-peer protocol used in the Jajah SIP and IAX compatible webphone
- open peer-to-peer protocol based on XMPP (Jabber) and being harmonised with the 'substantially equivalent' Google Talk protocol.
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