AT&T DS1/DMi/ISDN-PRI manual Procedure 000 Word 4 System 85 R2V4 & Generic

		ADMINISTRATIVE	PROCEDURE	SUMMARY	C-3
X.25	Opcode: 4 (assuming no codeset mapping)
	Information transfer capability: unrestricted digital information
	Coding standard: CCITT
	Information transfer rate: coded to a 0
	Transfer mode: packet mode
	Layer and protocol identification: recommendation X.25 link level (LAPD)
	(layer	2)
	Layer	and protocol identification: recommendation	X.25 packet	level (layer	3)

PROCEDURE 000 WORD 4 (System 85 R2V4 & Generic 2)

Field 4 of this word is used to assign an NPA-NXX designator to an extension or range of extensions. If an extension is not assigned an NPA-NXX designator, calls originated from this extension over ISDN-PRI trunks do not have a calling party number IE in the setup messages. Likewise, calls terminating to this extension over ISDN-PRI trunks do not have connected number IEs in the connect messages.

The same designator can be assigned to a range of extensions via one change execute operation if no unassigned numbers are within the entered range (see the Procedure 354 Word 3 section in this appendix for more information).

PROCEDURE 010 WORD 4 (System 85 R2V4 & Generic 2)

This word is used to assign ISDN routing parameters to extensions for both System 85 R2V4 and Generic 2, and to associate a BC for extensions for System 85 R2V4.

ISDN Routing Parameters (System 85 R2V4 & Generic 2)

For System 85 R2V4, field 4 of this word applies; for Generic 2, it is field 3.

While many parameters are	associated with route selection (for	example,	Facility	Restriction	Levels
or FRLs, compatible match	of BCs , and clear channel versus	restricted	channel),	the effect	of the

ISDN routing parameter field as it relates to route selection is discussed next. There are three possible encodes that may be entered in the applicable field:

0Use any available facility in a pattern. For example, based on the specific dialed digits, you could have a call routed to a specific pattern that may have one or more preferences. The first available trunk found in the highest preference will be used (for example, 1 is a higher preference than 2 and 2 is a higher preference than 3). Therefore, if an available trunk is found in preference 1, it is used.