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Appendix J
Troubleshooting
If you have difficulty with your telephone, please try the suggestions below. 
For Customer Service, visit our website at 
www.telephones.att.com
, 
or call 
1 (800) 222-3111
. In Canada, dial 
1 (866) 288-4268
. Have 
the serial number, found on the underside of your phone, available when 
contacting customer service. Please retain your receipt as your proof of 
purchase.
To purchase accessories or replacement parts, please contact customer 
service by visiting our website at 
www.telephones.att.com
 or calling  
1 (800) 222–3111
. In Canada, dial 
1 (866) 288-4268
.
My telephone appears to 
be dead.
•  Make sure the power adapter is securely 
plugged into an outlet not controlled by a wall 
switch.
•  Make sure the telephone line cords are plugged 
firmly into the telephone base and the jack.
•  Unplug the telephone’s electrical power. Wait 
for approximately 15 seconds, then plug it back 
in. Allow up to one minute for the telephone to 
synchronize.
•  This system is not compatible with any other 
AT&T 4-line small business telephones, except 
for the 1080, 1070 and 1040 telephones.
System features, 
(intercom, transfer, hold 
release, etc.) do not work 
with my old AT&T 4-line 
telephones (984, 974, 945, 
etc.).
•  This system is not compatible with any other 
AT&T 4-line small business telephones, except 
for the 1080, 1070 and 1040 telephones.
Intercom, hold, call 
privacy or other 
advanced features do 
not work properly.
•  If you have fiber optic service (digital service 
to the building, analog service within the 
building), VoIP (Voice over the Internet) service, 
or cable telephone service, the router that 
the system uses might interfere with system 
communication.
•  If Line 1 is a DSL line, have a professional 
install a splitter on the telephone line. See the 
installation guide and contact your DSL service 
provider for more information.
•  Make sure that the LINE GROUP assignment is 
correct. See page 43 of the installation guide.