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FreePhone is an easy to use IP phone application. FreePhone supports major platforms and protocols. Features include Conference calling, Voice mail and Chat rooms. A SDK is available for you to make additional features.
Simple command line IP telephonly application for Linux, that doesn't conform to either H.323 or SIP, doesn't use RTP and is not interoperable with any other program. It does work well though, and has quite good audio quality.
Open source Call Center software, based on H.323/SIP protocols.
Contains Nauphone(Software multi-channel IP Phone, with conferences and ability
to integrate with other systems(CRM)) and NauLib(VoIP Library based on OpenH323 and Vovida SIP)
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PNX system develops the middle-ware source code to glue Asterisk with a number of powerful telephony products such as: 1) OpenH323 H.323 stack 2) Vovida SIP stack 3) Bayonne Voice Automation Platform The advantages? An advanced IP PBX supporting the wide
An H.323 compliant Linux server that accepts calls from intenet "phone" software and routes them out onto the public telephone network via a voice modem.
UVOIP is a privacy-enhancing technology for unobservable voice communication between two parties on the Internet. M.Knezevic, V.Velichkov, "Demonstration of Unobservable Voice Over IP", ADAMUS'08
The SIP2IMS gateway aims to enable simple SIP clients to access IMS networks and provide support for IMS features such as Service-Routes, AKA authentication, IP-Sec/TLS etc.
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JabbahVoice is an open-source framework which allows developers to easily create and extend voice portals using Asterisk (www.asterisk.org), the famous open-source IP PBX.