Delivering stability via redundant power supply, OpenVox gateways support up to 4 port E1/T1 with max 120 simultaneous calls in one device. Solutions support selection of codecs and signaling protocols, including G.711A, G.711U, G.729, G.722, G.723, GSM, SIP, and PRI, and are 100% compatible with Asterisk, Elastix, trixbox, 3CX, FreeSWITCH SIP server, and VOS VoIP operating platform. GUI aids setup, and secondary development can be completed through AMI (Asterisk Management Interface).