Lucent Technologies 555-661-150 manual SECURITYlALERT

MERLIN LEGEND Communications System Release 6.1	Issue 1
Network Reference 555-661-150	August 1998
6 Troubleshooting
Call to Non-Local Extension: Silence or Fast Busy Tone	Page 6-8

■To change the extension FRL, see System Programming, Chapter 3, “Common Administrative Procedures.”

■To change the FRL assigned to a remote access barrier code, see “Remote Access” in System Programming, Chapter 4. Follow the guidelines in “Remote Access Default Class-of-Restriction Settings” on page 6 .

!SECURITYlALERT:

FRLs, applied to ARS and UDP routes, default CORs for all tie and/or all non-tie tandem trunks, extensions, and remote access barrier codes are particularly important for maintaining security in a private network. Before changing FRLs in your system, check with the coordinating system manager, who should understand the security implications for your local system and for the private network as a whole.

Changing local FRLs may not work simply because the problem is not on the local system. In this case, go to Possible Cause 5.

Possible Cause 5: The FRL for the default COR for non-tie trunks (PRI) on the remote system may be blocking tandem calls. The private network is an all PRI network.

What to Do: Check with the coordinating system manager so that he or she can determine where the problem exists. This may involve more than one system, depending upon how your private network is set up. For example, a call might be routed across the private network in a fashion such as this:

Origin System A→System B→System C→Destination System D

In this configuration, the coordinating system manager must check routes and default COR attributes for Systems B and C.

■Check to make sure the calling restriction of the default COR is set to unrestricted. The factory setting is outward restricted, which blocks calls across the private network.

■Check that the routes voice/data capability is correct for the type of call being made. The factory setting is Both, which will support both voice and data calls.

■In each intervening system, compare the FRLs assigned to routes for the call with the default COR FRL. The route FRL must be equal to or lower than the default COR value or the call is blocked. The factory setting is 3.

■If FRL settings are not the cause, go to Possible Cause 6.