The Yeastar P560 VoIP PBX is an adaptive, professional, reliable PBX phone system for SMEs. It allows businesses to have uninterrupted communications in at all times in a fully-fledged system. Users 100 / 200, Max Concurrent Calls 30 / 60, Max Call Centre Agents 100 / 200, Max FXS Ports 8, Max BRI Ports 8, Max GSM/4G Ports 4, Max E1/T1/J1 Ports, Expandable D30.