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Distributed Communications System B Private Networking
Administration for Network Connectivity
CID: 77730 555-233-504 — Issue 1 — April 2000
354
• If AAR is active, FRLs and Traveling Class Marks (TCMs) can be sent along with
the private network number. UDPCode and AARCode conversions use the FRL
assigned to the caller. ENPNode conversion always raises the FRL to the
maximum (7).
If an FRL is insufficient to access the facility, access is denied. There is no prompt
for an authorization code even if authorization codes are enabled and
administered.
• If AAR is not active, tandem-tie trunks should not be used to transport UDP
numbers. The TCM is not recognized at the terminating switch.
Note: Never use tandem-tie trunks to transport UDP numbers (the TCM
and Hop count will not be recognized as such following the
extension received at the receiving switch).
Interactions • Automatic Alternate Routing
AAR routes UDP calls. (Included with UDP is the required AAR subset.) If AAR
is enabled in addition to UDP, then the 7-digit AAR number provides the same
routing as UDP.
• Dial Plan
~ All of the extension numbers on a switch are not necessarily part of UDP. Any
that do not belong to UDP are handled by a regular, non-UDP Dial Plan
associated with the switch.
~ When administering the Dial Plan form and designating a group of extensions
as UDP non-local, you can specify whether you want to search for local
extensions first or last. This allows flexibility to change extensions from local
to non-local and vice-versa.
• DID Trunk Group
DID calls to 5-digit UDP extension numbers require that the DID trunk group
insert enough digits to make a 5-digit extension number.
• Distributed Communications System
UDP is required when DCS is provided. The necessary UDP software is provided
with the DCS software.
• Extension Number Portability
If an extension code is administered to use ENP node routing, ENP routes the call
to the correct switch. If AAR is enabled in addition to UDP, the 7-digit AAR
number provides the same routing as UDP (that is, via ENP).