A domain based multi-tenant PBX & voice switch for FreeSWITCH
Issabel PBX - Unified Communications
VICIdial Contact Center Suite
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Open source CSTA library
Unified Communications Server
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Proximus Forum 700 pbx dial number management
Asterisk based VoIP pbx appliance
Kazoo Live Medium. From Null to a Full Featured PBX on minutes
A Better PBX For Your Business
Enterprise telephony recording and retrieval system
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Java VoIP/SIP PBX system (replaced by jfPBX)