Vtiger Integration with Asterisk Vtiger Integration with Telzio Vtiger Integration with Duocom Tata Tele Services Integration with Vtiger VICIdial Integration 3CX Phone Integration with Vtiger Vtiger Integration with Exotel Vtiger Integration with Plivo Vtiger Integration with Twilio Vtiger Integration with Ozonetel Vtiger Integration with Tata Teleservices