Issabel PBX - Unified Communications
The most affordable CRM system according to Capterra
Open source CSTA library
Unified Communications Server
Unified Communications System - PBX System
Proximus Forum 700 pbx dial number management
Kazoo Live Medium. From Null to a Full Featured PBX on minutes
A Better PBX For Your Business
Enterprise telephony recording and retrieval system
Asterisk and kannel integration
A complete invoice managment solution for Elastix PBX
VozBox. Asterisk VoIP PBX.
vTiger Freeswitch PBX Integration
Asterisk and Yate (VoIP PBX) Scripts and Libraries
This Webmin module aids in configuring the Dahdi interface to Asterisk
CRM system based on vtiger, adapted to Polish companies.