Session Initiation Protocol (SIP) is a signaling protocol used to control multimedia communication sessions, e.g., video and voice calls over IP. This protocol is used to create, modify and terminate unicast and multicast sessions. Modifications may include altering ports, introducing new media streams, or inviting additional participants. This can include video conferencing, file transfers, instant messaging, presence information and file transfers. SIP was designed in 1996 by Mark Handley and Henning Schulzrinne. The Internet Engineering Task Force (IEFT) working group designed the latest version of SIP, RFC 3261. SIP is a text-based protocol employing many similar elements to Hypertext Transfer Protocol (HTTP) and Simple Mail Transfer Protocol (SMTP). Like HTTP, SIP follows a request and response model, wherein a client request summons a given function on the server and one or more responses.

 
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Sip Trunking

Latest Headlines

Latest Headlines

Sprint adds Microsoft Lync to its UC collaboration solution, appeals to mobile workforces

Sprint is playing into the emerging mobile nature of its business clients by adding Microsoft Lync to its cloud-based unified communications (UC) solution,  Sprint Complete Collaboration, which it debuted in 2012. 

Sprint extends IP backbone in Paris via Neo Telecoms

Sprint is continuing its ongoing IP European wireline network expansion effort with a new agreement with Neo Telecoms to extend its reach in Paris.

Allstream expands reach of SIP trunking service

Allstream, a Canadian service provider focused on business services, is now offering its Session Initiation Protocol (SIP) Trunking service out of 1,000 telephone exchanges.

XO simplifies SIP trunking choices for businesses with session-free pricing

XO Communications is giving its business customers an easier way to migrate their existing TDM-based trunking systems to SIP with a simplified pricing structure.

Momentum acquires Twist Networks to grow SIP, hosted business

Momentum, a St. Louis-based cloud provider, is acquiring Communications Technologies, Inc. subsidiary (CTI) Twist Networks, a move that will help it grow its SIP trunking and managed services business lines.

Internet2, 20 universities create SIP Steering Committee

Internet2 has formed the SIP Steering Committee as a way to help set the direction and priorities for its NET+ SIP Program and the Internet2 Technology Evaluation Center at Texas A&M University.

Sprint to offer SIP trunking in 12 European countries

Sprint is expanding the reach of its SIP trunking solution for businesses into 12 European countries, a move that will enable it to create a larger bond with its business customers that have a presence in the region.

Alteva adds cloud, free calling capabilities to its SIP trunking product set

Alteva is increasing the value of its SIP trunking portfolio for its growing base of large business customers by allowing customers the ability to access cloud services and get free calling services between offices.

The 10 hottest wireline technologies in 2013

What are the hottest technologies in the wireline segment of the telecom industry this year? From Carrier Ethernet 2.0 to Virtual NIDs and more, FierceTelecom takes a look at the technology and trends that are reshaping telecommunications.

Birch finishes IP network expansion to 290 central offices

Birch Communications on Monday completed the last phase of its multi-year network upgrade and expansion project during which it added 43 central office colocations, for a total of 290 COs, and 15 wireless towers for its wireless local loop services in five states.