VICIdial Contact Center Suite
The most affordable CRM system according to Capterra
Unified Communications Server
Enterprise telephony recording and retrieval system
ERP, IP PBX, Accounting, CRM, Time tracking, and etc.
Java VoIP/SIP PBX system (replaced by jfPBX)
vTiger Freeswitch PBX Integration
Informacion sobre llamadas desde pbx desde puerto serial
CRM system based on vtiger, adapted to Polish companies.
predictive dialing for vTiger using asterisk