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Tandberg Video Communication Server - SIP application server, media server and H.323 gateway; ... a free/open source software communications platform for making SIP, ...
FreeSWITCH is a free and open-source telephony software for real-time communication protocols using audio, video, text and other forms of media. The software has applications in WebRTC, voice over Internet Protocol (VoIP), video transcoding, Multipoint Control Unit (MCU) functionality and supports Session Initiation Protocol (SIP) features.
Kamailio, formerly OpenSER (and sharing some common history with SIP Express Router (SER)), is an SIP server licensed under the GPL-2.0-or-later license. It can be configured to act as a SIP registrar, proxy or redirect server, and features presence support, RADIUS / syslog accounting and authorization, XML-RPC and JSON-RPC-based remote control, SQL and NoSQL backends, IMS / VoLTE extensions ...
SIP Witch is released as free software under the terms of version 3 or later of the GNU General Public License (GPL). It is designed for Linux, macOS, BSD and Windows and planned support for Android. [1] In the popular Linux distributions Ubuntu and Fedora it may be installed directly from the standard package sources. [2] [3]
SipXecs is a free software enterprise communications system. [1] It was initially developed by Pingtel Corporation in 2003 as a voice over IP telephony server located in Boston, MA. [2] The server was later extended with additional collaboration capabilities as part of the SIPfoundry project.
A SIP phone is an IP phone that implements client and server functions of a SIP user agent and provides the traditional call functions of a telephone, such as dial, answer, reject, call hold, and call transfer. [16] [17] SIP phones may be implemented as a hardware device or as a softphone.
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It is common for SIP ALG on some equipment to interfere with other technologies that try to solve the same problem, and various providers recommend turning it off. [4] [5] [6] An ALG is very similar to a proxy server, as it sits between the client and real server, facilitating the exchange. There seems to be an industry convention that an ALG ...