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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Features and technical reference
1388IP trunk service
20
PSTN Example
For example, say you create trunk group 10 and assign its members to the first 12
potts on the IP trunk circuit pack. Then you create a route pattern (for example, 5)
with trunk group 10 for the first route preference and the trunk group for PSTN
access for the second route preference. On the ARS analysis form, telephone
numbers going to remote site A use route pattern 5. If the quality of service to
remote site A becomes unacceptable, the DEFINITY IP Trunk application uses
inservice/active status to block the trunk group members (trunk group 10) in Line
Pool 1. A call routed to route pattern 5 follows the second route preference, which
is the switch’s PSTN access trunk group. The call routes over the regular
telephone network. When the DEFINITY IP Trunk application determines that the
quality of service to remote site A is acceptable again, it unblocks (makes idle) all
of the members in the Line Pool 1. The switch routes new calls to trunk group 10,
and sends the calls over the IP trunks.
Additional trunk groups, route patterns and set of ARS analysis entries are created
for additional ports on the IP circuit pack for another Line Pool associated with
additional remote sites.
To summarize, there are a number of possible situations concerning PSTN
Fallback. The following are some of the more common ones:
PSTN Fallback is not used
1. Create one trunk group for all of your licensed channels.
2. Create one route pattern that contains only the above trunk group.
3. For each remote site, create a set (depending on the level off-premise
dialing allowed) of ARS analysis entries that all point at the IP trunk route
pattern.
PSTN Fallback is used with one remote site
1. Create one trunk group for all of your licensed channels.
2. Create one route pattern that contains the above trunk group as the primary
route and a PSTN trunk group as the secondary route.
3. Create a set (depending on the level off-premise dialing allowed) of ARS
analysis entries for the remote site that all point at the IP trunk route
pattern.