AT&T SB35020 User Manual page 103

Syn248 SB35020 Deskset User's Guide
Caller ID is not working. The display shows
for the phone number.
Probable Cause
Your organization does not
subscribe to caller ID service
or you have DSL phone lines
without filters installed.
Troubleshooting
and a digit for the name, and the same digit
 Phone# 
Corrective Action
Caller ID is a subscription service. You must

subscribe to this service from your local
telephone service provider for this feature to
work on your phone.
The caller must be calling from an area that

supports caller ID.
Both you and your caller's telephone companies

must use caller ID compatible equipment.
If you have DSL phone lines, confirm that you

have a DSL filter plugged in between each
Deskset and DSL wall jack. The DSL filter must be
plugged into the wall jack, not the Gateway.
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