Lucent Technologies 555-661-150 manual How Facility Restrictions Levels Work in a Network

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 4-9

Table 4–2. Recommended Settings for Tie and Non-Tie Default COR and Callback

	Recommended
Setting Name	Setting	Description
Barrier Code	On	Requires barrier code entry for remote access calls on DID,
Requirement		PRI dial plan-routed, dedicated or shared remote access, or
		tandem facilities. Remote access calls will arrive over
		tandem trunks if the Remote Access code is included in the
		non-local dial plan of the calling system. Ignored for UDP
		calls across the network.
Calling	Unrestricted	Allows routing across the network. Toll restrictions can still
restrictions		be applied to remote access calls on DID or PRI dial plan-
		routed facilities, as long as barrier codes are required.
Facility	Higher than 1	For a call to be routed to the PSTN or to an extension on
Restriction		another system in the network, the FRL assigned here must
Level		be equal to or greater than the UDP or ARS route FRL.
Allowed List	None	Not Applicable
Disallowed	Disallowed List 7	Prohibits calls to the numbers in the list. Modify as needed.
List		Other lists can be assigned to barrier codes and default
		CORs.
Automatic	No	Applies to all remote access calls that arrive on PSTN
Callback	recommendation	trunks but does not apply to UDP- and ARS-routed network
		calls. For extensions making intersystem or ARS calls,
		Callback can be turned on or off at the extension.
How Facility Restrictions
Levels Work in a Network		4

The diagram in Figure 4–1 illustrates how FRLs function in a network. An extension’s FRL is compared to the local ARS route FRL or the local dial plan route FRL, whichever is used for the call. If the extension user has dialed a Remote Access code included in the non-local dial plan, the user’s barrier code FRL is compared to the UDP or ARS route FRL before the call leaves the calling system (barrier codes must be required in the default COR setting on the called system for the applicable type or types of tandem facilities). If the extension or barrier code FRL is equal to or greater than the route FRL, the call goes through.