Direct inward system access (disa), Class of service (cos), Cos passwords – Nortel Networks T7316 User Manual

Page 128: Maintain security

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Chapter 11 System features

P0937240 03.1

Remote users can access system lines, line pools, the page feature, and remote administration (if
enabled through Software Keys). The exact facilities available to you through remote access vary
depending on how your installer set up your system.

Direct Inward System Access (DISA)

Control external access to your system with direct inward system access (DISA). If your installer
programs the line used for remote access to answer a call automatically and wait for a DISA
internal number, callers hear a stuttered dial tone and must enter a Class of Service password
before they are allowed into the system.

Class of Service (COS)

To control the level of telephone service a remote user can access, the installer can assign a remote
filter and remote package to the line used for remote access. The remote filter limits the numbers
dialed on the line, and the remote package limits the use of line pools and the page feature. To
change the restrictions for the line, the user can enter their COS password when the system
answers with DISA, or dial the DISA internal number and enter their COS password.

COS passwords

COS passwords permit controlled access to system resources, both by internal and remote users.
When you enter a COS password at a telephone, the restriction filters related with your COS
password apply, instead of the normal restriction filters. In the same way, when a remote user
enters a COS password on an incoming auto-answer line, the restriction filters and remote package
related with their COS password apply, instead of the normal restriction filters and remote
package. The installer programs the COS passwords.

Maintain security

Normally, each user has a separate password. However, several users can share a password or one
user can have several passwords.

To maintain the security of your system, the following practices are recommended:

Warn a person to whom you give the remote access number to keep the number confidential.

Change COS passwords often.

Note:

If the loop start line used for remote access is not supervised, auto-answer does not

function and the caller hears ringing instead of a stuttered tone or the system dial tone.

Note:

VoIP trunks

You cannot program DISA for voice over IP (VoIP) trunks, therefore, your system cannot
be accessed from an external location over a VoIP trunk. VoIP trunk configuration is
discussed in the IP Telephony Configuration Guide.

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