AT&T DS1/DMi/ISDN-PRI manual Not applicable For

	ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2	7-87
Field 4	Retry permits multiple attempts to seize a busy trunk from the specified trunk
	group.

This field is primarily applicable for those trunk groups routed over analog facilities and uses trunk types 41, 42, 43, 46, or 47. Depending on the particular configuration, retry may or may not be applicable for ISDN applications. Field encodes and their descriptions are:

0 Multiple retry is not desired, that is retry not active

NOTE: The ISDN-PRI protocol contains an automatic retry capability.

Whenever trunk type 120 is selected, the zero (0) encode is required.

1Recommended for ISDN applications where the 40-series of trunk types is used This encode enables a double try single retry and thus provides slightly improved call completion, particularly for large trunk groups that span across more than one transmission facility.

Field 5	Not applicable		for	ISDN	applications	(encode	must	be	0	for	not active).
Field 6	Not	applicable	for	ISDN	applications	(encode	must	be	0	for	not active).
Field 7	Not	applicable	for	ISDN applications (encode must be 0 for no failure threshold).

NOTE: This field is only applicable for analog trunk facilities. It permits the user to establish a trunk failure threshold that, when exceeded, will generate an alarm. The threshold limit will affect service availability and, on an indirect basis, the customer’s maintenance costs.