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Accessories for the M3900 Series telephones
Full Duplex Hands Free Module
The Full Duplex Hands Free Module provides simultaneous audio paths for
transmitting and receiving during hands free calls. The Full Duplex Handsfree
Module is available for the M3904.
Headsets
Amplified headsets are compatible with your M3900 Series Meridian Digital
Telephone. The amplified headset is an option for noisy environments. An
amplified headset should be connected to the handset jack. The Headset Key is
not able to control a headset that is connected to the handset jack. In this
configuration, do not select Headset as the On hook default path.
For an amplified headset, adjust the volume using the Volume Control Bar on
your telephone before adjusting the volume on your headset amplifier. To
minimize distortion, the volume setting on the amplifier should be higher than the
volume setting on the telephone.
Unamplified headsets are compatible with the M3903 and M3904. An
unamplified headset should be plugged into the headset jack. With Headset
selected as the On hook default path, you can make calls or answer incoming
calls by pressing a DN Key.
For an unamplified headset, access Volume Adjustment in the Options List to
adjust the headset volume and sidetone (M3904) that work best with the headset
you are using. You may also use the Volume Control Bar to adjust the headset
volume while you are on a call.Refer to your distributor for the latest product
bulletin from Nortel Networks for recommended headset types for the M3900
Series telephones.
Key-based Expansion Module
The Key-based Expansion Module provides additional line (DN) or feature keys
for the M3904. You can add up to two Key-based Expansion Modules, for a total
of 44 additional line (DN) or feature keys.
Personal Directory PC Utility
The Personal Directory PC Utility provides a faster, easier way to create or modify
the Personal Directory on the M3904. You can enter names and numbers into a
directory file on your PC, and download the file directly from the PC to the M3904
through a serial port connection. You can also upload the Personal Directory from
the M3904 to your PC so that you can modify the directory. The PC and the
M3904 are connected using the Personal Directory PC Utility Cartridge. The
Computer Telephony Integration Adapter (CTIA) may also be used to connect the
PC and the M3904 when used with the optional Personal Directory PC Utility
software.