AT&T SB67030 Administrator's Manual page 244

Symptom
A buzzing sound on my
TL7600 Headset.
Unable to deregister TL7600
Headset.
Troubleshooting
Synapse Administrator's Guide
Probable Cause
Noise interference.
The Deskset is unavailable
(powered off, out of range, or
removed from the system).
You cannot identify or locate
the Deskset the Headset is
registered to.
Corrective Action
Move the Headset at least 12 inches away from the
Deskset.
Other electronic products can cause interference with
your Cordless Headset. Try installing your Headset as far
away from these types of electronic devices as possible:
television sets, microwaves, or other cordless telephones.
Deregister the Headset at the Headset. Press: VOL+ –>
MUTE –> VOL– –> MUTE –> VOL+ –> VOL– –> MUTE.
If the Headset is registered to an unknown Deskset which
has AC power, you must carry the Headset out of range
of the Deskset and perform the Deregistration sequence
described above. You will know when the Headset is out
of range when you press ON/OFF and you hear three
beeps and no dial tone.
244
Cordless Headset