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

CenturyLink proposes TDM-to-IP transition trial in Las Vegas

CenturyLink has asked the FCC for permission to conduct its own TDM-to-IP trials with a particular focus on business customers replacing their traditional POTS voice services with VoIP. The service provider expects the proposed trial in Las Vegas to last approximately six months in 12 wire centers.

Sprint serves up unified communications for European businesses, enhances collaboration capabilities

Sprint is giving its international business customers another way to enable more effective interoffice communications by extending its cloud-based unified communications service, Complete Collaboration, to 12 European countries.

Cisco maintains dominant spot in enterprise session-border-controller market, says Infonetics

Cisco remained the dominant enterprise session border controller (eSBC) vendor in the first quarter, according to Infonetics'  Enterprise Session Border Controllers  report.

VoIP, unified communications to grow to $88B market by 2018, says Infonetics

Business VoIP services have migrated out of the kicking-the-tires phase to what Infonetics says is "mainstream" due to ongoing adoption of SIP trunking and cloud services.

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.