The most affordable CRM system according to Capterra
Open source CSTA library
Unified Communications System - PBX System
Asterisk based VoIP pbx appliance
Enterprise telephony recording and retrieval system
Implement Screen Pop for Avaya PBX
VozBox. Asterisk VoIP PBX.
vTiger Freeswitch PBX Integration
This Webmin module aids in configuring the Dahdi interface to Asterisk