Lucent Technologies Definity Enterprise Communication Server 8.2 User Manual

Issue 1

April 2000

Features and technical reference 

1414

Look-Ahead routing 

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

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.

■

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