| Function Characteristics | |
| Voice Services | Support voice connections from PSTN to IP, from PSTN to PSTN and from IP to PSTN Support the RTP stream transmitl Support ring-back tone at PSTN/ IP directionl Support encryption of Signaling and media stream |
| DTMF | Pass through, RFC2833, H.245, support call back |
| Fax | T30 Transparent Transmission、T38 Relay |
| Route Configuration | Maximally Supports 100 IP and PSTN network static prefix routes |
| Control Management | Managed by using TELNET, serial port, FTP, TFTP and assort the management of configuration, alarm, billing, safe management and multilevel management |
| Signaling Protocols | |
| PSTN Protocol | ISDN PRI：ETSI EURO ISDN |
| VOIP Protocol | H.323 V4、SIP RFC3261 |
| IP Protocol | RTP、RTCP、TCP、UDP、READIUS, etc. |
| Voice | G.711, G.723, G.726, G.729a/B, G.728Echo Cancellation, Maximal tail length 128msVoice Activity Detection (VAD)Comforting Noise Generation (CNG) |
| Hardware Criterions | |
| Power | -48V DC |
| Size | 19 inch×8U×260MM (width×height×depth) |
| Trunk Interface | Maximum support 4 pieces E1, each E1 has 8 ports of E1. The port of E1 is RJ-48 or BNC. The capacity has flexible from 8 E1 ~ 32 E1. |
| Insert slot | 12(2slot of power, 2 slot of control card, 8 slot of operating cards) |
| Ethernet Interface | RJ-45 10/100Base-T Maximum 6 pieces. |
| Serial Interface | RJ-45 (one) |
| Environment Conditions | |
| Working Temperature | 0 ~ 40 °C |
| Working humidity | 10% ~ 90% |
