AT&T AT3111-2 - Manual (Page 31)

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Caller ID operation
Caller ID operation
Information about caller ID with call waiting
This product has a caller ID function with call
waiting feature which works with service from
your local telephone company.
Caller ID with call waiting lets you see the name
and telephone number of the caller before
answering the telephone, even while on another
call.
Contact your local telephone company if:
• you have both caller ID and call waiting, but
as separate services (you may need combined
service), or
• you have only caller ID service, or only call
waiting service,
• you do not have caller ID or call waiting
services.
There may be fees for these services, and they
may not be available in all areas.
This product can be used without subscribing to
either caller ID or combined caller ID with call
waiting service, although the caller ID features of
this product will not function.