User`s manual

U.S. Robotics I-modem Command Reference
Dial Security • Page 9-18
4. To end the remote session and reactivate Dial Security on the host, reset the guest
device by typing:
ATZ <Enter>
Warning If you do not use the ATZ command to end a remote-access session,
Dial Security will remain disabled at the host, and anyone dialing in to
the host for remote access will have access to the I10 screen and all
Dial Security accounts.