Lucent Technologies Release 8.2 manual Extended Trunk Access, Case #1, Case #2

Distributed Communications System B Private Networking

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
	Form		Field
	Dial Plan Record	•	ETA Routing Pattern
	(First Digit and Second Digit Tables)	•	ETA Node Number
	ETA Call Screening Table	•	Call Screening Entry

	! 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	CASE #1
administration	• 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

		Administration for Network Connectivity
344	CID: 77730	555-233-504 — Issue 1 — April 2000