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Distributed Communications System B Private Networking
Administration for Network Connectivity
CID: 77730 555-233-504 — Issue 1 — April 2000
344
Extended Trunk Access
Use Extended Trunk Access (ETA) in conjunction with Uniform Dial Plan (UDP) to
allow DEFINITY ECS to send any unrecognized number (such as an extension not
administered locally) to another switch for analysis and routing. Such unrecognized
numbers can be Facility Access Codes, Trunk Access Codes, or extensions that are
not in the UDP table. Non-UDP numbers are administered on either the First Digit
Table (on the Dial Plan Record form) or the Second Digit Table. They also are not
administered on the ETA Call Screening Table. ETA helps you make full use of
automatic routing and UDP.
How to administer ETA
!
CAUTION:
Switches can be chained together using ETA. However, you must ensure that
switches do not route in a circular ETA call setup. Switch A can route to switch
B, and switch B can route to switch C. But, if switch A routes to switch B and
switch B routes to switch A, you create a circular ETA call setup.
Detailed description Historically, ETA has been used by satellite switches to access stations, trunks, and
features at the main switch. ETA frees you from having to enumerate the entire dial
plan for the main or satellite complex. Calls that would get intercept treatment
without ETA are routed to a remote switch to be reprocessed. The following
processing takes place when ETA is administered:
• ETA call is identified because it fails all other routing possibilities.
• The dialed string is not in the ETA Call Screening Table.
• An available route pattern is selected based on the Dial Plan form ETA Routing
Pattern or ETA Node Number entries.
• The dialed string is sent to the remote switch.
Examples of ETA
administration
CASE #1
• ETA Route Pattern — Not administered
• ETA Node Number — Not administered
In this case, ETA is not active. It is not used to route undefined dialed strings.
CASE #2
• ETA Route Pattern — Administered
• ETA Node Number — Not administered
Form Field
Dial Plan Record
(First Digit and Second Digit Tables)
• ETA Routing Pattern
• ETA Node Number
ETA Call Screening Table
• Call Screening Entry