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(1) (Soft-Switch) Earlier software from Soft-Switch, Inc. that converted email messages from one protocol to another using X.400 as a common base. Running on IBM mainframes and Data General minicomputers, Soft-Switch, Inc. became a division of Lotus in 1995. See X.400.

(2) A programmable switch that processes the signaling for packet-based telephony protocols. Also known as a "media gateway controller," "call agent" or "call server," telephony providers use softswitches to integrate PSTN signaling (SS7) with VoIP. Using network processors at its core, softswitches can support IP, DSL, ATM and frame relay transports in the same unit. The softswitch's programmability enables it to adapt to future protocols. See IP telephony, VoIP and SIP.

It Should Be Able To...
According to the International Softswitch Consortium, a softswitch should be able to (1) control connection services for a media gateway and/or native IP endpoints, (2) select processes that can be applied to a call, (3) provide routing for a call within the network based on signaling and customer database information, (4) transfer control of the call to another network element, and (5) interface to and support management functions such as provisioning and billing.

Softswitch Infrastructure
This shows how a softswitch fits into the integrated SS7 and VoIP worlds. (Illustration assistance courtesy of GNP Computers and
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References in periodicals archive ?
Flashphoner develops its own WebRTC media server Web Call Server 5, a software platform for browser-based broadcasts from web cameras and for online video calls.
Web Call Server 5 is an award-winning solution to connect the dots between dozens of various streaming video solutions, VoIP software, browsers and operating systems.
Paris-based European communications specialists NextiraOne said today that it has supplied an Alcatel-Lucent Omni-PCX Enterprise IP Media Gateway call server for installation at the Neumayer III Research Station in the Antarctic.
"The recently announced IEX DaVinci VoX Call Server, coupled with our IP7 Secure Gateway, gives us superior offerings within two of the most critical components required to facilitate seamless convergence of voice and data networks," Margolis continued.
The fifth version of Web Call Server embodies 5 years of development, thousands of hours of tests, hundreds of bug fixes and improvements.
New York, NY, September 20, 2015 --( Flashphoner releases unique real-time streaming video player for mobile iOS Safari browser based on HTML5 technology, as a part of its solution Web Call Server 4 - server-side streaming video and telecommunication platform.
Alcatel-Lucent said that Hub telecom is the first operator to incorporate the new Alcatel-Lucent 5060 IP Call Server into its core network.
A "hacker" could attempt to impact a call server by sending a flood of call setup requests to the well-known signaling port for that server.
Moscow, Russia, February 15, 2015 --( Flashphoner company released an add-on for its Web Call Server 4 product, which allows low-latency video streaming to iOS Safari browser.
The SI3000 Control Plane product family, designed for various types of operators and service providers, includes a Call Server, a Management System, a Signaling and Media Gateway, a Media Server and a Voice Application Server.
The solution optimizes the connection between handsets and the call server to support the exacting requirements of voice communications, minimizing latency for a better end-user experience.
Web Call Server 4 being a linchpin of in-browser video transmission allows implementing almost any scenario for WebRTC-based audio and video communications in a browser including webinars, SIP integration, browser calls to stationary and mobile phones, "call from a website" function and many more.