AT&T CRL81112 Complete User's Manual page 59

Appendix
Troubleshooting
Common cure for electronic equipment.
If the telephone does not seem to be responding normally, try putting the
cordless handset in the telephone base or charger. If it does not fix the
problem, do the following (in the order listed):
1. Disconnect the power to the telephone base.
2. Disconnect the cordless handset battery.
3. Wait a few minutes.
4. Connect power to the telephone base.
5. Completely remove the battery. Replace the battery and place the cordless
handset into the telephone base or charger.
6. Wait for the cordless handset to reestablish its connection with the
telephone base. Allow up to one minute for this to take place.
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