AT&T TL8900 User Manual page 40

Appendix
Troubleshooting
My calls cut in and out while I'm using my cordless headset.
Other electronic products such as HAM radios and other DECT
X
phones, can cause interference with your cordless headset.
Try installing your telephone base as far away as possible from
these types of electronic devices.
Do not use the headset near a microwave oven. You may
X
experience decreased performance while the microwave oven
is operating.
If your headset is located near a modem, move your headset
X
and modem further apart from each other.
Relocate your telephone base to a higher location. The headset
X
will have better reception when not installed in a low area.
If other phones in your home or office are having the same
X
problem, the problem is in your wiring or telephone service.
Contact your telephone service provider (charges may apply).
I cannot register the headset.
If you want to register this headset to an AT&T DECT 6.0
X
telephone, make sure the telephone is compatible with this
headset. Visit
for a list of compatible telephones.
Your telephone has a limitation of the number of headsets that
X
can be registered to it. If the maximum number of headsets
are already registered, you need to deregister the registered
devices before you can register this headset. Refer to the
user's manual of the telephone for more details.
The light on the headset is off while charging.
Make sure the power cord is plugged in correctly and securely.
X
Make sure that the battery is securely installed in the
X
cordless headset.
https://telephones.att.com/headsets
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