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2. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   Jami, with GTK/Qt GUI, also supports IAX2 protocol, for Linux, OS X, Windows GPL; Jitsi, a Java VoIP and Instant Messaging client with ZRTP encryption, for FreeBSD, Linux, OS X, Windows; LGPL; Linphone, with a core/UI separation, the GUI is using Qt libraries, for Linux, OS X, Windows, and mobile phones (Android, iPhone, Windows Phone, BlackBerry)

3. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   Voice over IP has been implemented with proprietary protocols and protocols based on open standards in applications such as VoIP phones, mobile applications, and web-based communications. A variety of functions are needed to implement VoIP communication.

4. Comparison of VoIP software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_VoIP_software

   This is a comparison of voice over IP (VoIP) software that examines applications and systems used for conducting voice and multimedia communications across Internet Protocol (IP) networks. VoIP technology has transformed telecommunications by offering alternatives to traditional telephony systems while providing enhanced features and cost savings.

5. Open Phone Abstraction Library - Wikipedia

   en.wikipedia.org/wiki/Open_Phone_Abstraction_Library

   OPAL implements a wide range of Voice over IP (VoIP) protocols for voice, video and fax data over IP networks. It is written in C++ and released under the Mozilla Public Licence. OPAL utilises the PTLib portable library that allows OPAL to run on a variety of platforms including Unix/Linux/BSD, MacOSX, Windows, Windows mobile and embedded systems.

6. H.323 - Wikipedia

   en.wikipedia.org/wiki/H.323

   It is a part of the ITU-T H.32x series of protocols, which also address multimedia communications over ISDN, the PSTN or SS7, and 3G mobile networks. H.323 call signaling is based on the ITU-T Recommendation Q.931 protocol and is suited for transmitting calls across networks using a mixture of IP, PSTN, ISDN, and QSIG over ISDN.

7. Windows Live Call - Wikipedia

   en.wikipedia.org/wiki/Windows_Live_Call

   Phone Call - PC-to Phone voice calls to landline and wireless numbers anywhere in the world (charges applied) The Phone Call service utilized Windows Live Messenger and Voice over Internet Protocol technology to provide users an inexpensive way to make domestic and international phone calls from a computer. [1]