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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1414Look-Ahead routing
20
NOTE:
When country code 13, protocol version a, is administered on the DS1
Circuit Pack screen, only the cause values #10 and #89 activate LAR.
LAR terminates when:
■ call is successfully routed
■ call is rejected with a non-LAR-triggering cause value
■ no further route preference can be used to route the call
LAR measurement
You can measure the number of attempted and successful LAR reroutes. The
Measurements LAR Route Pattern screen displays LAR measurements for a
particular route pattern. See DEFINITY ECS System Monitoring and Reporting
for more information.
Interactions
■ Automatic Circuit Assurance
LAR rerouting attempts are recorded as short holding time calls.
■ Distributed Communications Systems
If a non-DCS trunk preference is selected for rerouting a DCS call, DCS
feature transparency is lost. If LAR for a DCS call is done within the same
DCS trunk group, feature transparency is not lost.
■ QSIG Networks
If a non-Supplementary Services B (SSB) trunk preference is selected for
rerouting a SSB call, QSIG feature transparency is lost. If LAR for a QSIG
call is done through either the same or another SS B trunk group, feature
transparency is not lost.
41 temporary failure
42 switching equipment congestion
43 access information discarded
44 requested circuit or channel not available
47 resources unavailable
Cause Value Cause Description