VoIP channel number:240/8*E1
Ethernet Interface: 3* 10/100/1000M RJ45(1WAN+2LAN)
Digital Interface: 8*E1 for optional
Digital Interface Type: E1 (75Ω and 120Ω optional)
Call Control Protocol: SIP
PSTN signaling: PRI , 1 signaling , 7 signaling
Characteristics of echo cancellation: ITU-T G.168 2000，128ms（MAX）
Speech coding: ITU-T G.711(A-law/μ-law)、G.723.1、G.729
Fax technology: T.30、VBD、T.38
QoS technology: IPv4 ToS
Environmental Operating Temperature: 0 ℃ ~ 50 ℃; Humidity: 10% to 90%,non condensing
Power supply: +220V AC 0.5A/-48VDC 1.5A 40W
Dimensions(mm)(Width × depth × height): standard 19-inch 1U high rack 367 × 224 × 44mm
Voice Functions: 1*WAN port for active; Ring Groups; Advice of Charge; TCP, UDP & TLS protocols; SIP based NATing; SIP Transparent Proxy; Adaptive and Static Jitter Buffers; Least-Cost Call Routing; Static/Dynamic IP Addressing; Automatic Number, Multi VLAN Trunking; Identification; Call control using SIP Protocol; Packet Filtering; SIP adaptation; Application Level Gateways; SIP header manipulation; Voice Quality Monitoring