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 Voice Over IP 2 - Access to more VoIP technology information such as Voip for Cell Phone and SIP With Voice Over IP . The Voice Over IP 2 page also contains useful Voice Over IP related links.
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SIP With Voice Over IP. Session Initiation Protocol (SIP), is a leading signalling protocol for Voice over IP. A diagram showing how SIP enables VoIP and links to more SIP with Voice Over IP information.
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SIP With Voice Over IP
Session Initiation Protocol (SIP) is a protocol developed by the IETF MMUSIC Working Group and proposed standard for initiating, modifying, and terminating an interactive user session that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. In November 2000, SIP was accepted as a 3GPP signaling protocol and permanent element of the IMS architecture . It is one of the leading signalling protocols for Voice over IP, along with H.323.
Although many other VoIP signaling protocols exist, SIP With Voice Over IP has become a popular combination. SIP is characterized by its proponents as having roots in the IP community rather than the telecom industry. SIP has been standardized and governed primarily by the IETF while the H.323 VoIP protocol has been traditionally more associated with the ITU. However, the two organizations have endorsed both protocols in some fashion.
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SIP With Voice Over IP
Companies such as Vonage and SIPphone were consumer SIP pioneers and have a fast growing subscriber base. Major carriers like AT&T and Level(3) are now following suit. The traditional telecommunications industry (including companies such as Lucent Technologies and Nortel) is now focused on developing systems based on the architecture model and SIP extensions as defined by 3GPP in their IP Multimedia Subsystem (IMS).
Some VoIP phone companies, such as BroadVoice, who use SIP With Voice Over IP allow customers to bring their own SIP devices, including SIP-capable telephone sets, the Asterisk PBX, or softphones. The new market for consumer SIP devices continues to expand.
The open source community started to provide more and more of the SIP technology required to build both end points as well as proxy and registrar servers leading to a commoditization of the technology, which accelerates global adoption. SIPfoundry has made available and actively develops a variety of SIP stacks, client applications and SDKs.
The most relevant links we could find, placed here free
 SIPWiki - More information about SIP With Voice Over IP can be found on this webpage. www.toyz.org
Javvin - You can find out more detailed information about how SIP With Voice Over IP works here. www.javvin.com
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