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Setting Up Caller ID Screening
An originating Modemulator has the option of sending a Caller ID (CID) number during the connection
handshake.
If the answering Modemulator has CID enabled, it will compare the received CID number with the phone
numbers stored in its dialing directory. If the CID number is not found, the connection will fail and the
originating Modemulator will display REFUSED.
Caller ID cannot be used when the answering Modemulator is operating in single-ended mode.
In the case of Modemulators replacing legacy dial-up modems, it is recommended that each
originating Modemulator CID number be programmed with its former PSTN phone number. Each
answering Modemulator should have an entry in its dialing directory containing the originator's
phone number.
The User can, however, select any numeric string (up to 23 digits) as a Caller ID number, as long
as the answering Modemulator has a corresponding entry in its dialing directory.
The originating and answering Modemulator must both be configured to enable Caller ID, which can be
done locally (pre-deployment) or remotely (post-deployment). The following steps will describe how to do
local configuration. To do remote configuration, see
Here are the steps for locally setting up Caller ID Screening:
1. Enter a CID number in the originating Modemulator
Connect a computer serial port to the originating Modemulator Terminal port with a serial cable.
Run a terminal application on the computer to facilitate sending commands into the Modemulator.
Use the
{I command
Modemulator handshake protocol. The CID number may be up to 23 numeric (0-9) digits.
Attempting to enter a non-numeric character or more than 23 digits will return ERROR.
Example:
AT{I=18005551234
The number written by the {I command is automatically stored to EEPROM. It does not require
you to send &W.
2. Enable CID in the originating Modemulator
Issue the
{C1 command
Example:
AT{C1&W
Modemulator User Guide
to enter the Caller ID number that will be sent to the Listener during
to enable CID in the originating Modemulator.
Page 89 of 113
Appendix H
for details about using Remote Access.
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