Remote Access has inherent risks, such as large-scale unauthorized long distance use of your telecommunications facilities. To increase the security of your system, use a 7-digit barrier code, and administer expiration dates and access limits for each of the 10 barrier codes that are available to you. If your system has more than 10 Remote Access users, the users must share barrier codes. A barrier code automatically expires if the expiration date or the number of accesses exceeds the limits that you set. You can administer the system to limit:

• The length of time that an access code remains valid

• The number of times that an access code can be used

• Both the length of time that an access code remains valid and the number of times that an access code can be used

When you no longer need a barrier code, remove the code from the system.

If you administer barrier codes, a special answer-back tone causes a calling modem to leave dial mode. Sometimes a modem dialer is used to gain access with Remote Access. When a dialer of a modem is used to gain access with Remote Access, the special answer-back tone cancels echo suppressors on the network. The cancellation of echo suppressors in the network prevents dual-tone multifrequency (DTMF) tones from breaking dial tone from Communication Manager.

Use the status remote-access command to view the status of a Remote Access barrier code.

Call Detail Recording (CDR) does not track the use of barrier codes.