AT&T DS1/DMi/ISDN-PRI manual Network Service/Feature Options, shows the relationships, Isdn

		ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85				7-45
Field 4	Translates ISDN trunk type 120 only. Recall that for ISDN applications the trunk
	type may be translated as fixed (that is, one specific type) or dynamic (which may
	include those from the fixed category). Generally, the trunk type selected will
	depend on the network service or feature value, which is translated in field 5. Table
	7-4,Network Service/Feature Options, shows the relationships.
		TABLE 7-4.Network Service/Feature	Options
		Network Service (or)		Network	ISDN
		Network Feature		Value	Trunk Type
		OUTWATS Banded (Note 1)		33-288	(Note 2)
		Operator Handled		324	47
		Pre-Subscribed Common Carrier Operator		325	47
		SDN		352	47
		MEGACOM 800 Service (inc. International)		(Note 4)	n/a
		MEGACOM Service		354	47
		INWATS		355	47
		WATS Maximal Subscribed Band		356	47
		ACCUNET switched digital service		357 (4E13)	47

NOTES:

1.OUTWATS bands 0 through 255 are assigned sequential numeric values ranging from 33 through 288 (for example, band 0 is network service value 33).

2.Trunk types 26 and 27 (DMI data) may be translated depending on local requirements.

3.The trunk group administered to this preference must be assigned as trunk type 120 (dynamic trunk type) in procedure 100, word 1.

4.Connection made with procedure 309, word 5. Not available in System 85 R2V4.

Field 5	Specifies the network service that is requested. Refer to Table 7-4, Network
	Service/Feature Options, for the appropriate encode.

Fields 6 through 10 are translated to enable or disable one or more BC codes for the ARS plan — pattern number — preference number.

Field 6	Enables (1) or disables (0) support for voice or voice-grade data BC code.
Field 7	Enables (1)	or disables (0)	support for data mode 1 BC code.
Field 8	Enables (1)	or disables (0)	support for data mode 2 BC code.
Field 9	Enables (1)	or disables (0)	support for data mode 3 BC code.
Field 10	Enables (1)	or disables (0)	support for data mode 0 BC code.