♦ Full duplex FM quality (15 kHz) audio bandwidth at connect rates of 24 kb/s and above.♦ Full duplex audio scales from 12.7 kHz to 4.7 kHz at connect rates of 21.6 kb/s to 9.6 kb/s. ♦ Separate “Voice Mode” allows 7 kHz audio with a 300 BAUD ancillary data channel and extra forward error correction. ♦ Easy to use dialing and configuring interface. ♦ Automatically connects at highest possible rate supported by telephone connection. ♦ Monitors line quality and renegotiates should line degrade. ♦ Ability to “store and forward” 9 3/4 minutes of audio. A full fidelity feed may be recorded and sent over a low bit-rate circuit to be played later in non-real time. ♦ Two tally closures (one on connection, one triggered by the user). ♦ Ability to work with a Comrex BlueBox, HotLine or Vector. ♦ Ability to store 19 telephone numbers and last number dialed in nonvolatile memory. ♦ Short coding delay (100 mS) allows seamless two-way conversation. ♦ Accessory slot allows insertion of optional module Included, adapting the Matrix for use on ISDN.Works fine.Item is sold AS-IS, no refunds or returns.