User guide

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Table of Contents
Message and Call Status Indicator (M3901) ......................................... 105
Accessories for the M3900 Series telephone 107
Accessory Connection Module (ACM) ................................................. 107
Analog Terminal Adapter (ATA) ......................................................... 107
External Alerter and Recorder Interface ............................................... 107
Headsets ........................................................................................... 107
Key-based Expansion Module ............................................................. 107
Meridian Communications Adapter (MCA) .......................................... 108
Meridian 1 Flexible Feature Codes (FFC) 109
Meridian SL-100 Feature Access Codes (FAC) 110