Lucent Technologies MERLIN LEGEND Release 6.1 Maintenance And Troubleshooting Manual page 291

MERLIN LEGEND Communications System Release 6.1
Maintenance and Troubleshooting 555-661-140
Private Network Calling Problems
!
SECURITY ALERT:
FRLs, applied to ARS and UDP routes, default class-of-restrictions (COR)
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, see "Call to Non-Local Extension: Silence or Fast
Busy Tone" in Chapter 6 of Network Reference .
Call to Non-Local Extension:
Silence or Fast Busy Tone
The following are likely circumstances in which silence occurs when a call is
attempted:
A selected tie or analog facility between the caller or called extension is
out of service. If your system is linked by tandem tie trunks and silence
occurs, call the other system on a PSTN line/trunk in order to determine
whether a tie trunk is out of service. If it is not, call the Lucent
Technologies Helpline at 1 800 628-2888; consultation charges may
apply.
No Touch-Tone Receivers (TTRs) available at a remote system when
using tie trunks. This can be verified by checking for the
the error log on the remote switches. If this error persists, contact your
local service representative.
A fast busy tone can have one of several causes. Before investigating further,
check the following possibilities:
A technician may be performing maintenance on local tandem trunks or
non-local tandem trunks included in the routes for the call.
Issue 1
August 1998
Page 5-45
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