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Voice 2.0 is a slang term referring to IP phones and Web technologiess that execute Voice over IP (VoIP) applications. Voice 2.0 applications function like traditional phones or softphones and may include simulated graphics with interactive display panels.
Voice 2.0 endpoints share a communication protocol and at least one audio codec, such as Session Initiation Protocol (SIP), which is an Internet Engineering Task Force (IETF) standard.
Skype and Google Talk are Voice 2.0 applications with proprietary protocols and Extensible Messaging and Presence Protocol (XMPP). Voice 2.0 applications may offer the open-source Inter-Asterisk Exchange protocol (IAX).