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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Call-Handling Scenarios
Page 2-20Network Configuration Scenarios
2
Non-Local Dial Plans and Facilities Planning 2
This section shows how non-local dial plans, calling groups, switch identifiers,
UDP routing, ARS routing, and remote access are set up for each system. Not all
details are provided for all facilities and extensions.
Table 2–1, page 2-22
shows some applicable extension ranges, patterns, and
routes for pools when people in one system call people at non-local extensions.
For each route, there is a pool number, an FRL, and assignment of voice and/or
data service. Digit manipulation is required for routes that use PSTN trunks, which
are assigned high-numbered FRLs and are available to only a few users. Digit
manipulation is also required for routing coverage or calling group overflow calls
to the centralized VMS/AA. Reserved pools are assigned for high-speed 2B data
calls, which must not be queued using the Automatic Callback feature. Restrictive
FRLs are unnecessary for these routes, because they are for data only and
cannot be used for voice calls.
NOTE:
Pools for voice only calls on PRI tandem trunks should not include data
trunks. System Alarms will result if voice extensions try to access data
trunks. If PRI tandem trunks carry voice and data calls, “voice/data” should
be assigned as the route attribute.
In this example, voice calls over tandem trunks to the non-local system are
permitted for all users. When all private network routes are unavailable, voice
users can employ Automatic or Selective Callback feature to queue for Route 1.
To ensure that high-priority callers are not waiting too long for tandem trunks to
become available, split the tandem trunks into separate routes with different
FRLs.
The Remote Access code for each system is unique and unambiguous, so that
users from one system can make lower cost remote access calls into the other
system for technical support reasons or for changing forwarding options at their
home extensions on remote systems. Users must enter barrier codes in order to
make these remote access calls into the non-local system via the non-local dial
plan. Their barrier code FRLs must permit the remote access calls using the UDP
routes.
Table 2–2, page 2-24
shows how the system managers set up their local systems
so that users on the other system can access their local PSTN facilities. It also
illustrates how they allow local users to access PSTN facilities on the other
system. Table 2–3, page 2-25
summarizes the key points about routing for calls
originating in the private network systems. As you review the tables, note the
following rules:
■ Local ARS routing analyzes the initially dialed digits to determine whether a
call can be handled more economically using local or non-local PSTN
lines/trunks.