Using SIP

Posted by admin on Sep 13, 2011 in SIP | 0 comments

Several companies have jumped on board and begun rolling out SIP products to help business globally.
One of them is Odyssey Systems, a telecoms company based in Stockton-On-Tees, England.


SIP allows businesses to use a specific “local” number in any geographical area, thus reducing the cost of international calls and minimise the number of conventional lines required.


The systems not only saves businesses money, but allows companies to have geographical numbers for an area where they don’t have a physical presence.


For more information on SIP, SIP products, and Odyssey Systems, please visit their site on

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History Of SIP

Posted by admin on Sep 13, 2011 in SIP | 0 comments

SIP was originally designed by Henning Schulzrinne and Mark Handley in 1996. The latest version of the specification is RFC 3261 from the IETF Network Working Group. In November 2000, SIP was accepted as a 3GPP signaling protocol and permanent element of the IP Multimedia Subsystem architecture for IP-based streaming multimedia services in cellular systems.


The free software 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 commodification of the technology, which has accelerated global adoption. As an example, the open source community at SIPfoundry actively develops a variety of SIP stacks, client applications and SDKs, in addition to entire private branch exchange (IP PBX) solutions that compete in the market against mostly proprietary IP PBX implementations from established vendors.


The National Institute of Standards and Technology (NIST), Advanced Networking Technologies Division provides a public domain implementation of the JAVA Standard for SIP which serves as a reference implementation for the standard. The stack can work in proxy server or user agent scenarios and has been used in numerous commercial and research projects. It supports RFC 3261 in full and a number of extension RFCs including RFC 3265 (Subscribe / Notify) and RFC 3262 (Provisional Reliable Responses) etc.

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Posted by admin on Feb 22, 2011 in SIP | 0 comments


SIP – ( Session Initiation Protocol ) – SIP allows computers to communicate with each other, without the need of calls routing through central stations.

This results in calls being a lot cheaper, as you no longer have to pay for the connections between caller and receiver.

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