Adtran MX2820 M13 MUX Card 1186002L3 Phones and has a firewall built

and has a firewall built into the unit

10 Pre-Programmed Feature Keys

The Adtran 1200655L1 supports up to 44

The 4212916L1 is the second generation version of the Adtran Total Access 916

A display has been built into the phone to provide caller ID and digits dialed in the system

Adtran MX2820 M13 MUX Card 1186002L3 Phones and has a firewall builtAdtran MX2820 M13 MUX Card 1186002L3 Description: The Adtran 1186002L3 is a multiplexer M13 module for the Adtran MX2820. The 1186002L1 provides a DS3 circuit breakdown into 28 DS1 circuits. Two M13 MUX cards provide a single 1: 1 redundant M13 multiplexer circuit. These cards plug directly into the Adtran MX2820 chassis. Adtran 1186002L3 Features: Plug in unit for the MX2820 chassis that provides an M13 multiplexer function to the MX2820 system Two