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User's Guide for ZyXEL Omni 56K and Omni 56K Plus Modems
3-7
Caller Number Delivery (Caller ID)
Caller Number Delivery (CND), commonly called Caller ID, is a new kind of phone service that
may be offered by your local phone company. Check your phone company for availability. You
must subscribe to it and usually pay an additional monthly service charge for this service.
With CND service, the phone company's central office will send the coded caller information to the
called station. This information is sent once between the first and second ring. Your modem can
decode this caller information and present it to the connected computer/terminal during the second
ring period as part of the call progress ring message. The modem will also report the Caller ID
information if asked by the command AT*T.
There are two kinds of caller information message formats sent by the phone company.
One is the single message format which includes date, time, and caller ID
The other is the multiple message format which also includes the caller name as registered with the phone
company.
The command ATS40.2=n is used to enable (n=1) or disable (n=0) the Caller ID detection function.
The default is disabled. Enable it only when you have this service and want to enable its detection.
NOTE: The Caller ID message may cause some communication
software that is not expecting it to become confused. If you plan to
use the Caller ID feature, be sure you are using software that supports
it.
In single message format, the modem will send a ring message to the terminal as follows:
RING
TIME: <MM-DD hh:mm>
CALLER NUMBER: <CALLER_ID> or CALLER NAME:<CALLER_NM>
RING