AT&T 7500 series, 7100 series, 2500 series, 7200 series, 7400 series, 7300 series manual ∙ Rnx

2-12COMMUNICATION SYSTEM NETWORKING — AN OVERVIEW

____________________________________________________________________________________________________________________________
_
					CONDITIONAL
		MATCH EXT			ROUTING
EXTENSION	EXT + NODE			EXT + NODE + RNX	COUNT
NUMBER			TO
		RNX
PORTABILITY
FROM					OBTAIN
INTERNAL
					PATTERN
DIAL
PLAN		MATCH RNX
UNIFORM	EXT + RNX			EXT + (NODE) + RNX
			TO
DIAL PLAN
		NODE
FUNCTION
				TRUNK TYPES
			(RNX) - XXXX
		OBTAIN		40-49, 108, 109, 120
			PRIVATE NETWORK
	PREFERENCE
		FROM	(NPA) NNX − XXXX
	PATTERN
				16-28, 120
			PUBLIC NETWORK
	PREFERENCE
		DATA

Figure 2-2.AAR Processing

number.

∙If the Uniform Dial Plan function is effective in the switch, AAR receives the RNX number of the destination switch and the destination extension number.

For extension number portability calls, AAR then finds the RNX of the destination switch in a table that cross-references the extension to the RNX. When the Uniform Dial Plan function is active on the System 85 or Generic 2, AAR finds the node number of the destination switch in a table that cross-references the RNX to the node number. On the System 75 and Generic 1, the internal dial plan provides only the RNX for further AAR processing.

At this point in call processing, AAR has either received or derived the following information on the destination of each call:

∙Extension

∙Node (System 85 and Generic 2 only)

∙RNX

On the System 85 and Generic 2 communications system, AAR uses the node number and conditional call routing count, to find the routing pattern that is most appropriate for the call. It does this by finding the node number in a table that cross-references the node number to a routing pattern. The pattern lists the trunks groups (preferences) over which it is possible to send the call. On the System 75 and Generic 1 communications systems, only the RNX is used to find the routing pattern that is most appropriate for the call.