| Physical Interfaces | 
| •ISDNInterface 1/2*E1/T1, G.703, 120ΩRJ-48c | 
| •Network InterfaceWAN and LAN, 2 * 10/100M Base-TX, RJ-45 | 
| •RS232 ConsoleRJ-45, 115200bps | 
| Voice & Fax | 
| •G.711A/U law (G.723.1, G.729A/B, iLBC–optional) | 
| •Silence Suppression & Detection | 
| •Comfort Noise Generation (CNG) | 
| •Voice Activity Detection (VAD) | 
| •Echo Cancellation (G.168) | 
| •Adaptive (Dynamic) Jitter Buffer | 
| •Call Progress Tone Generation | 
| •Programmable Gain Control | 
| •T.38/Pass-through | 
| •DTMF Mode: Signal/RFC2833/Inband | 
| Physical Feature | 
| •Power: input:100-240V,50-60Hz output:12VDC,1.0A | 
| •Temperature(operation): 0 ℃~ 45 ℃ | 
| •(storage): -20 ℃~80 ℃ | 
| •Operation Humidity: 10%-90% no condensation | 
| •Dimension(w/D/H): 225*150*38mm | 
| •Weight: 0.75kg | 
| Protocol | 
| •SIP-RFC3261,3262,3263,3264, | 
| •SDP-RFC 2327 | 
| •RTP/RTCP-RFC2198,1889 | 
| •Network Protocol | 
| IP,TCP, UDP,TFTP, FTP, RTP, RTCP, | 
| ARP/RARP,ICMP Ping, NTP, SNTP,
Http, DNS | 
| Signal | 
| •PRI/PRAISDN E1/T1,JapanT1.ITU-T I.431, Q.921, Q.931, ETSIQ.sig | 
| •R2China and other 22 variants | 
| Maintain & Upgrade | 
| •Web based configuration | 
| •Data backup/restore | 
| •Support English and Chinese | 
| •Firmware upgrade by TFTP/web | 
| •Web & Telnet login password modify | 
| •Factory reset | 
| •Output CDR/Tracking newsby syslog | 
| •Call status information statistics | 
| Certifications | 
| • CE,FCC |