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http://www.voip-info.org/wiki/view/Open+Source+VOIP+Software
http://blog.csdn.net/xuyunzhang/article/details/26859341
Asterisk
Asterisk is an open source framework for building communications applications. Asterisk turns an ordinary computer into a communications server. Asterisk powers IP PBX systems, VoIP gateways, conference servers and other custom solutions. It is used by small businesses, large businesses, call centers, carriers and government agencies, worldwide. Asterisk is free and open source. Asterisk is sponsored by Digium.
SIP Clients (UA‘s)
SIP tools
H.323 Clients
Some of these include SIP proxy functionality
Text-to-speech and speech-to-text (voice recognition)
开源sip server & sip client 和开发库 一览
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原文地址:http://www.cnblogs.com/welhzh/p/4601683.html