Lucent Technologies Release 8.2 manual Considerations

Distributed Communications System			B Private Networking
	If a user at extension 41000 wants to call extension 61234, there are two choices:
	•	Dial 61234
	• Dial the AAR access code followed by 222-1234
	If 61234 is dialed, the system recognizes 61 as a remote UDP, determines the
	associated RNX (222), and uses AAR to route the call to 222-1234.
	If the AAR access code and 222-1234 are dialed, the system finds the route pattern
	for RNX 222 and routes the call to the switch associated with that RNX.
	Whenever UDP is used to route a call to another switch, the correct digit deletion and
	insertion must be specified within the route pattern so that the receiving switch gets
	digits in the format it expects. DEFINITY ECS can be configured in several different
	ways.
	• If AAR is available on the receiving switch, Subnet Trunking can be used to insert
		the AAR feature access code on the originating switch or digit insertion may be
		used to insert it on the receiving switch. The receiving switch then uses AAR digit
		conversion to convert 222 with 7 digits to an extension by deleting 3 digits and
		inserting a 6.
	• If AAR is not available on the receiving switch, Subnet Trunking must be used on
		the originating switch to delete the 222 and insert the digit 6 at the beginning of
		the extension number so that the receiving switch can continue to route correctly.
	If the user at extension 51234 on Switch C dials extension 61234, the call must first
	go through Switch A before proceeding to Switch B. When 61234 is dialed, the
	system recognizes 61 as a UDP code, determines the associated RNX (222), and uses
	AAR to route the call. The AAR feature access code plus 222-1234 are outpulsed to
	Switch A. Switch A then recognizes the RNX 222 as a remote switch and routes the
	call to Switch B and extension 61234. This same type of call routing occurs when an
	extension at Switch B calls an extension at Switch C.
	If extension 61234 on Switch B calls extension 61235, the system recognizes 61 as a
	local UDP code and routes the call directly to extension 61235.
Considerations	•	In North American network environments, extensions beginning with 0 may route
		to an attendant. You are encouraged to use another number as the leading digit
		when assigning extensions.

• When you call an extension on another switch, there may be a slight delay before call-progress tones are applied. This delay is due to the trunk signaling necessary to complete the call to the remote switch.

• When you select the option to look at the UDP table first, calls that might otherwise terminate at a local extension route over the network. This is easily reversed. When you remove the extensions from the UDP table, the local extension can be dialed again.

Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000	CID: 77730	353