User guide

Your telephone call features

To switch from handset to handsfree:

1. Press the Handsfree Key.

2. Replace the handset.

To use headset: Connect a headset to the headset jack

or the handset jack depending on the

headset type and the telephone you

are using.

Press the Headset Key (M3903 and

M3904). For the M3902 read the

instructions that came with your

recommended headset.

Note 1: There are both amplified and

unamplified headsets that are compatible

with your M3900 Series Telephone. Refer

to Hardware Options for recommended

headset types for your telephone.

Note 2: Access Volume Adjustment in the

Options List to adjust the headset volume

and sidetone (M3904) that work best with

the headset type you are using.

To switch from handsfree to headset: Connect headset or put headset on.

Press the Headset Key (M3903 and

M3904). For the M3902 read the

instructions for the headset you are

using.

Headset