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.


Sip Trunking

Latest Headlines

Latest Headlines

IHS: More service providers are carving out IMS, NFV path

IMS and network functions virtualization (NFV) may be the hottest buzzwords in the telecom industry today, but a new IHS report revealed that only 8 percent of service providers it surveyed currently run these technologies in their networks.

Alaska Communications, Quintillion purchase North Slope dark fiber network

Alaska Communications and Quintillion Holdings, a regional service provider, are purchasing a fiber network from ConocoPhillips that they say will enable them to target business service opportunities in the region's growing oil and gas industry.

SIP trunking helped enterprise session border controller market hit $271M in 2014

Businesses' ongoing adoption of SIP trunking continues to be a boom for enterprise session border controller (SBC) vendors, a market segment that saw worldwide revenue rise to $271 million in 2014, says Infonetics in a new report.

Comcast Business addresses SMB, enterprise IP voice needs with SIP trunking service

Comcast Business is taking a long pass with its SIP trunking service, announcing that the service is available across its entire service area, covering 39 states and 20 major U.S. markets.

Alaska Communications brings SIP trunking to SMBs, enterprises in Anchorage

Alaska Communications (ACS) is now offering SIP trunking services to Anchorage businesses, the latest in a series of moves it has made to enhance its wireline service focus.

SIP trunking services drive enterprise session border controllers up 11%, says Infonetics

The enterprise market's ongoing adoption of SIP trunking is driving up the deployment of enterprise session border controllers (eSBC), as revenue rose by 11 percent to $73 million in the third quarter of 2014, according to a new Infonetics report.

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.