Lucent Technologies MERLIN LEGEND Release 6.1 Maintenance And Troubleshooting Manual page 292

MERLIN LEGEND Communications System Release 6.1
Maintenance and Troubleshooting 555-661-140
Private Network Calling Problems
A power failure may have occurred at the destination system or at
another private networked system whose tandem trunks are included in
routes for the call.
Some of the problems described in this section can occur when a
system manager makes a change in a private networked system's local
dial plan, non-local dial plan, switch identifier, or DS1 Switch Type
setting. Ensure that your private network system forms are kept
up-to-date and that changes are cleared with the coordinating system
manager.
Possible Cause 1: All programmed available routes for the call are busy.
What to do: Note the extension number range(s) being called. Check that the
pattern assigned to the range includes routes that include pools that have a
sufficient number of trunks to handle the call volume.
If you're not sure of the pattern number being used to route calls in your
local system, see "Reviewing the Non-Local Dial Plan and Routing" in
Chapter 6 of Network Reference .
To add different routes that can handle the call, consult the coordinating
system manager and see "Uniform Dial Plan Routing" in Chapter 5 of
Network Reference , or "UDP Routing" in Chapter 3 of System
Programming.
If you do not have enough tandem trunks to handle intersystem calls,
consider assigning pools of PSTN trunks to less preferred routes (4 or 3
and 4, for example). If you program such routes and they involve higher
toll costs than routes that specify tandem facilities, you may need to
adjust extension and route FRLs in order to restrict access to them. Be
sure that you discuss any changes with the coordinating system
manager.
If the routing is correct and enough routes are included in the pattern,
but the problem persists, check if PRI lines are used. If they are, check
the error log for D-channel inoperative and loss of signal alarms
indicating lines are inoperative. If the D-channel inoperative alarm has
Issue 1
August 1998
Page 5-46