Lucent Technologies MERLIN LEGEND Release 6.1 Maintenance And Troubleshooting Manual page 290

MERLIN LEGEND Communications System Release 6.1
Maintenance and Troubleshooting 555-661-140
Private Network Calling Problems
Call to a Non-Local Extension:
Unexpected Busy Tone
This topic discusses unexpected busy tones that may be caused by system
features. It applies not only to regular calls from one private network extension
to another but also to remote access calls that are routed among private
network systems. "Call to Non-Local Extension: Silence or Fast Busy Tone" in
Chapter 6 of Network Reference , outlines possible causes for a busy tone that
relate either to system programming of facilities or to call routing.
As a first step, the caller should try using Callback. All available local routes for
the call may be busy, and Automatic or Selective Callback allows the call to
queue for the next available tandem trunk assigned to the Route 1 pool.
If a user is having trouble with the Callback feature, see "Callback Does Not
Work" in Chapter 6 of Network Reference .
If the wait time for an available local trunk is unacceptable, you may be able to
change the local extension or barrier code FRL and/or route FRLs for the UDP
pattern in order to make more routes available for the call.
If you want to make changes in FRLs for routes, speak with the coordinating
system manager for your private network and consult the following resources:
"How Facility Restrictions Levels Work in a Network" in Chapter 4 of
Network Reference discusses FRL planning in detail.
To change a UDP route FRL, see "Uniform Dial Plan Routing" in Chapter
5 of Network Reference, or "UDP Routing" in Chapter 3 of System
Programming.
To change the extension FRL, see System Programming, Chapter 3,
"Programming Procedures."
To change the FRL assigned to a remote access barrier code, see
"Remote Access" in System Programming , Chapter 3. Follow the
guidelines in "Remote Access Default Class-of-Restriction Settings" in
Chapter 4 of Network Reference .
Issue 1
August 1998
Page 5-44