The system to be called must be running Basic Networking Utilities (BNU) or some version of the UNIX-to-UNIX Copy Program (UUCP).
This procedure describes use of the ct command to continue dialing a remote modem number until a connection is made or until a specified time has passed.
At the command line on the local system, type:
ct -w3 5550990
This dials the remote modem at phone number 555-0990. The -w3 instructs the ct command to dial the remote modem at one minute intervals until the connection is made or until three minutes have passed.
Note: Enter the phone number of the remote modem either before or after the flag.