AT&T TL7700 - Manual (Page 29)

Appendix
25
Troubleshooting
Common cure for electronic equipment.
If the unit does not seem to be responding normally, try putting
the cordless headset in its charger. If it does not fix the problem,
do the following (in the order listed):
Disconnect the power to the headset charger.
Remove the cordless headset battery.
Wait a few minutes.
Connect the power to the headset charger.
Install the battery again, and then place the cordless
headset into the headset charger.
Wait for the cordless headset to reestablish its connection
with the telephone base. Allow up to one minute for this to
take place.
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