Lucent Technologies 555-661-150 manual Merlin Legend Communications System Release

MERLIN LEGEND Communications System Release 6.1	Issue 1
Network Reference 555-661-150	August 1998
4 Security
Facility Restriction Levels and Remote Access	Page 4-7

The system manager sets the options listed below for the remote access default COR on his or her own system. If the system is linked to the network by tandem tie facilities (analog, T1-emulated voice, or data), the settings are assigned to all tie trunks. If only tandem PRI trunks link the system to the network, the settings are assigned to all non-tie trunks. If both tandem tie and tandem PRI trunks are connected to a system, the default COR FRLs and other restrictions are assigned to their restrictive types of trunks.

■Barrier Code Requirement. In a network, this setting should be turned on in order to require barrier code entry on calls that arrive from the PSTN over DID or PRI dial-plan routed facilities or that are made by dialing a Remote Access code included in the non-local dial plan. When barrier codes are not required, the remaining default COR settings apply to PSTN calls as well as network calls. This poses a security risk and does not allow adequate protection against toll fraud. The barrier code requirement is ignored for calls on tandem trunks, but the remaining default COR setting does apply to such calls.

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When barrier codes are required, the following restrictions can be assigned to individual barrier codes used on remote access calls that arrive on PSTN lines/trunks or that are made by dialing a Remote Access code included in the non-local dial plan:

—Restriction. Determines whether remote access users can make local and/or toll calls, and includes the following settings: Unrestricted, Toll- restricted, and Outward-restricted.

—ARS FRL. Allows or restricts use of outgoing trunks by assigning an FRL. The FRL ranges from 0 (most restrictive) to 6 (least restrictive).

—Allowed/Disallowed Lists Assignment. Disallowed Lists can be assigned. The factory setting is 3. Do not assign any Allowed Lists.

Calling Restrictions. This setting determines whether local and/or toll calls are allowed. The factory setting is outward- and toll-restricted. To allow call routing to the PSTN or to another system in the network, this setting should be changed to unrestricted, allowing the routing of all such calls.

Facility Restriction Level. Use this FRL setting by assigning a restriction level from 0 to 6, 0 is the most restrictive, and 6 is the least restrictive. The FRL value assigned here is the opposite of the FRL value assigned to an ARS route, where a value of 0 is the least restrictive, and a value of 6 is the most restrictive. The factory setting is 3. To restrict calls from using selected UDP or ARS routes, assign a value that is lower than the FRL assigned to the route. Network call routes (UDP or ARS) use this default COR FRL and do not use barrier codes. As long as you require barrier codes for the default COR setting, the barrier code FRL and not the default COR FRL, is applied to remote access calls that arrive on PSTN dial-plan routed PRI facilities or on DID trunks or that are made by dialing a Remote Access code included in the non-local dial plan.

■Allowed List Assignment. Do not assign any Allowed Lists.