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| Main Features | 8D5557 | 8D5558 | |
| 2 FXS RJ11 analog ports (POTs) |  |
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| 4 FXS RJ11 analog ports (POTs) | |
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| 2 BRI ISDN FXS RJ45 (Bus SO) | |
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| 4 ports 10/100BT LAN Ethernet switch | |
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| 1 USB port v.1 for the connection of a LAN PC | |
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| 1 RJ45 serial consolle port (optional, alternatively to the USB port) | |
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| Built-in ADSL IP Router | |
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| Multiple PVC management (up to 8) | |
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| Built-in firewall | |
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| DHCP Server, NAPT, NAT, Virtual Server, DMZ, DNS, Dynamic DNS, Routing statico, RIP1, RIP2 | |
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| v. 2 VoIP SIP support | |
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| Working with Proxy SIP Server | |
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| Codec G.711 A-law and U-law (64Kbps) | |
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| Codec G.729 (8Kbps) | |
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| In band DTMF and RFC 2833 support | |
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| G.711 in band Fax support | |
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| Additional services | |
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| TOS Quality of Service | |
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| CGN Comfort Noise Generate | |
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| CLI management in SFK mode | |
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| WEB based configuration | |
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| SNMP, DHCP, TFTP configuration (optional) | |
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| Command Line Interface configuration (optional) | |
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| FTP upgradable | |
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| Models | 8D5557 | 8D5558 | |
| External | |
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