Hearing Aid Compatibility; Wall Mounting - Northern Telecom 3X8 Owner's Handbook Manual

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To change to a Handsfree call while you are on a call using your
headset, unplug your headset. Your telephone's microphone and
speaker turn on and the call becomes a Handsfree call. (It is a
good idea to put the call on hold while you do this.)
You may see this prompt when you try to use a headset.

Hearing aid compatibility

The receivers on all
hearing aids as defined in the FCC rules, Part 68, section
68.316.
Not all hearing aids are optimized for use with a
telephone.

Wall mounting

Most telephones can be mounted on a wall. Contact your
Customer Service representative if you wish to have any
telephones in your system wall-mounted.
DR5.1 Owner's Handbook
You are attempting to use a headset,
but Handsfree/Mute is not
programmed for your telephone. If you
are not using a headset, you have
accidentally plugged your telephone
receiver into the headset jack on the
bottom of the telephone.
telephones are compatible with
PO84262701