Look-Ahead Routing - Avaya Communication Manager Administrator's Manual

Feature Reference

Look-ahead routing

Interactions
•
Night Service
If you activate night-service capability and a night console is not assigned or is not operational,
incoming LDN calls route as follows:
— DID LDN calls route to a designated DID LDN night extension. If no DID LDN night
extension is designated, DID LDN calls route to the attendant.
— Incoming CO or FX trunk calls route to the night destination specified for the trunk group.
If no night destination is specified for the trunk group, the calls route to the normal
incoming destination for that trunk group.
Internal calls and coverage calls to the attendant route to the DID LDN night extension during
night service.
Look-ahead routing
Look-Ahead Routing (LAR) allows Communication Manager to reroute an outgoing ISDN call that is
not completing. Communication Manager attempts to complete the call along a different routing
preference, or it tries the current routing preference a second time. If the current preference fails twice,
the next routing preference is tried.
LAR can be administered at an origination server/switch or a tandem server or switch. It can be turned off
at different points in the network to reduce network load. You use LAR with AAR and ARS, GRS, and
UDP) You can also use it with a FAC ISDN Access Code. A
Pattern screen.
NOTE:
When LAR is used in a mixed network of Communication Manager servers and Avaya
DEFINITY switches, LAR ends at the DEFINITY switch and calls are rejected the normal
way. However, if a LAR-triggering cause value is passed back in the network to an Avaya
DEFINITY server that is enabled for LAR, LAR is attempted from that server again.
Detailed description
LAR can be administered for each ISDN route preference in each Pattern Number. The maximum
number of LAR attempts per call per server or switch is 2 times the number of route preferences in the
route pattern. LAR can be administered at each intermediate node that the call may be tandemed through
to allow the attempt of all possible routes.
You can control LAR by:
•
administering it on a per route-preference basis
•
partitioning trunks
•
limiting the number of hop counts
1594
LAR
Administrator's Guide for Avaya Communication Manager
field is administered on the Route
November 2003