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A softswitch (software switch) is a call-switching node in a telecommunications network, based not on the specialized switching hardware of the traditional telephone exchange, but implemented in software running on a general-purpose computing platform. Like its traditional counterparts it connects telephone calls between subscribers or other switching systems across a telecommunication network. Often a softswitch is implemented to switch calls using voice over IP (VoIP) technologies,[1] but hybrid systems exist.
Although the term softswitch technically refers to any such device, it is conventionally applied to a device that handles IP-to-IP phone calls, while the phrase access server or "media gateway" is used to refer to devices that either originate or terminate traditional land line phone calls. In practice, such devices can often do both. An access server might take a mobile call or a call originating from a traditional telephone line, convert it to IP traffic, then send it over an IP network to another such device, which terminates the call by reversing the process and converting the voice over IP call to circuit-switched digital systems using traditional digital time-division multiplexing (TDM) or analog POTS protocols.
The call agents are the software switching elements of the softswitch. Other components handle functions for billing, directory services, network signaling. The network elements that convert voice streams between VoIP links and traditional media technologies, such as analog telephone lines, pair-gain devices, carrier systems, are called media gateways. A call agent may control many different media gateways in geographically dispersed areas via an IP network.
The softswitch generally resides in a building owned by a telephone company, called a telephone exchange or central office, or in a data center. Such locations have high capacity connections to carry telephone calls or digital communication to other switching centers.
Access devices to the services of a softswitch range from large media gateways with high port density to integrated access devices (IAD) at office locations, to small analog telephone adaptors (ATA) which provide just one RJ11 telephone jack to a residence. Embedded multimedia terminal adapters (eMTAs) are also built into cable television modems.
A softswitch routes telephone calls using the Signalling System No. 7 (SS7) network. SS7 modules may be implemented directly in the softswitch, or accessed from standalone signaling servers.
At the turn of the 21st century with IP Multimedia Subsystem (IMS), the softswitch element is represented by the media gateway controller (MGC) element, while the term softswitch is rarely used in the IMS context, where it is called an access gateway control function (AGCF).
^Buckley, Sean (February 20, 2013). "Carrier VoIP saw turnaround in 2012". Fierce Telecom.
A softswitch (software switch) is a call-switching node in a telecommunications network, based not on the specialized switching hardware of the traditional...
CommWorks was able to use technology from each company to create IP softswitch and IP communications software. U.S. Robotics provided media gateways...
original designer, Anthony Minessale, FreeSWITCH is intended to be a softswitch that is built around a core library, driven by a state machine, which...
PSTN with the control over the network residing in a call control center softswitch, which is analogous to the central office in the telephone network. The...
Dial-Gate VoIP Softswitch is a SIP-based IP-PBX software for businesses, first released in 2006 by Canadian VoIP PBX solution provider Dialexia. The software...
revenue for the VoIP wholesaler. The FAS fraud can be implemented in a softswitch in many different ways. These include: False billing of party A without...
testing and monitoring. A VoIP media gateway controller (aka Class 5 Softswitch) works in cooperation with a media gateway (aka IP Business Gateway) and...
Celstream Technologies, which specializes in product engineering. Cirpack, a softswitch manufacturer, was incorporated and acquired in April 2005. In July 2005...
Telecom: System X supplied by Marconi Communications. Marconi Softswitch and UTStarcom SoftSwitch. 4 submarine communication cables. 2 microwave links. Digital...
network element. For example: a signaling gateway is often part of a softswitch in modern VoIP deployments. The signaling gateway function can also be...
may be used for audio and video direct calls and calls through any VoIP softswitch or IP-PBX. Linphone also provides the possibility to exchange instant...
offer a choice of plan. In both cases, a SIP-compatible softphone, PBX or softswitch is configured to place certain (or all) outbound calls through the SIP...
is logically divided into two levels: The control of access (Class 5 softswitch); Network-border elements that separate the Public Domain from the Private...
supporting the targets' calls. The introduction of packet switched networks, softswitch technology, and server-based applications during the past two decades...
released Dial-Gate Softswitch PBX, a web-based softswitch and billing server based on the Session Initiation Protocol. A softswitch, short for software...
S2CID 41013. SSRN 867087. Glenn Rifkin (1994-06-17). "Lotus Agrees to Acquire Softswitch". The New York Times. Archived from the original on 2020-09-03. Retrieved...
tracking software for controlling a screen cursor with one's gaze and the SoftSwitch input device, both for paralyzed computer users, teaching radio technology...
Presse Sportive [fr] (International Sports Press Association) Advanced IP Softswitch Ante Up Intercontinental Poker Series Assisted Instrument Purchase Scheme...
"Fiberhome_Optical Network Products,Data Series Products,Fiber & Cable,SoftSwitch Products, Wireless Communication Products,Optical Module and Devices"...
network has been using the open-source project Yate for the core of its softswitch infrastructure. Sipgate are among the sponsors of the Kamailio World Conference...
Times, July 9, 2006. Cashing In Its Chips (Retrieved April 14, 2014) Softswitch, November 12, 2012. ViXS' XCode Network Media Processing Solutions Power...
controller/ softswitch, test and monitoring, content switch, cache server, storage Base station, multi service switch, media gateway controller / softswitch, access...
Thomson SA (now Technicolor) in April 2005. On top of its historical Softswitch devices product line, Cirpack introduced in 2010 its SBC (Session Border...
Platform, the TSP 7000 Hicom Trading E Hicom 300 HiPath HiQ 8000 Softswitch HiE 9200 Softswitch MSR32R EWSD telephone exchanges SPX 2000 small digital telephone...
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