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Trunk Management
DEFINITY Enterprise Communications Server Release 8.2
Overview
555-233-002
Issue 1
April 2000
Tandem
In an Electronic Tandem Network, DEFINITY ECS provides a variety of features on a
network-wide basis. Here are a few examples:
■ Uniform Dial Plan (UDP) — A unique four- or five-digit number assigned to each
station on the network. Uniform numbering gives each station a unique number
(location code plus extension) that can be used at any location in the Electronic
Tandem Network to access that station, DEFINITY ECS enhances the standard
UDP with the unrestricted 5-digit Uniform Dial Plan, which allows up to five digits to
be parsed for call routing.
■ Extension Number Portability — When employees move within the network, they
can retain their extension numbers. The ability to keep extension numbers, and
even Electronic Tandem Network and Direct Inward Dialed numbers, when moving
to other locations within the company eliminates missed calls and saves valuable
time.
■ Traveling Class Marks — Traveling Class Marks are a mechanism for passing a
caller’s facility restriction level from one Extended Tandem Network switch to
another. Traveling Class Marks allow privilege checking to be passed across
switches through the Electronic Tandem Network.
■ Automatic Alternate Conditional Routing — You can control the routing of particular
calls using conditional routing. For example, you can limit the number of
communications satellite hops (communications satellite links used as trunks) in
any end-to-end private network routing pattern. Limiting the number of satellite
hops may be desirable for controlling transmission quality or call delay in both voice
and data calls.
■ Enhanced Trunk Signaling and Error Recovery — The reliability of Electronic
Tandem Network calls is improved by allowing a trunk call to be retried on another
circuit when signaling failures occur.
tandem switch: A switch within an electronic tandem network (ETN) that provides the
logic to determine the best route for a network call, possibly modifies the digits outpulsed,
and allows or denies certain calls to certain users.
tandem through: The switched connection of an incoming trunk to an outgoing trunk
without human intervention.
tandem tie-trunk network (TTTN): A private network that interconnects several
customer switching systems.
See also, ‘‘ATM-Port Network Connectivity (ATM-PNC)’’ on page 107.
233002_1.book Page 82 Monday, February 21, 2000 8:28 AM