Lucent Technologies MERLIN LEGEND Release 6.0 Network Reference Manual page 209

MERLIN LEGEND Communications System Release 6.0
Network Reference 555-660-150
6 Troubleshooting
Call to Non-Local Extension: Silence or Fast Busy Tone
To change a UDP route FRL, see
5–19
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
!
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 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
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 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 network is set up. For example, a call might be routed
across the network in a fashion such as this:
Origin System A
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 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.
or "UDP Routing" in Chapter 4 of System Programming.
System B System C
"Uniform Dial Plan Routing" on page
Destination System D
Issue 1
February 1998
Page 6-7
4–6.