AT&T DS1/DMi/ISDN-PRI Procedure 309 Word 5 System 85 R2V4 & Generic, Field 4, Isdn Trunk Type

ADMINISTRATIVE PROCEDURE SUMMARY C-13

PROCEDURE 309 WORD 5 (System 85 R2V4 & Generic 2)

This word deals with the sending of a particular NSF IE in the setup message and with rules of route selection.

Field 4, ISDN Trunk Type

This field can only contain a value when the trunk group associated with the plan, pattern, or preference has a type of ISDN dynamic. Here, it must have a value entered or the outgoing call over this preference will fail. The selection of a trunk type is not crucial since the ARS feature determines code flow more so than does the trunk type. However, an appropriate trunk type should be selected for the calls associated with this plan, pattern, or preference.

Field 5, Network Service Value

The value entered in this field along with the value entered in field 12 of procedure 309, word 1, (the IXC/ISDN network identifier) determine the NSF IE for calls routed over this plan, pattern, or preference. An NSF IE is not sent if a value is not entered. If field 5 has no value but an IXC/ISDN network identifier is specified, the network identification is specified with the transit network selection IE instead of the network-specific facilities IE.

The following subsections examine the layout of this IE for both System 85 R2V4 and Generic 2.