EQ-Project / Long Entry

SS7-ISUP, DSS1 Facility Message (FAC)

SS7-ISUP (45/Q.763 (09/97))

A message sent in either direction at any phase of the call to request an action at another exchange. The message is also used to carry the results, error or rejection of a previously requested action.

Parameter Type Length (octets) Notes
Message type F 1
Message compatibility information O 3-?
Parameter compatibility information O 4-?
Remote operations O 8-?
Service activation O 3-?
Call transfer number O 4-?
Access transport O 3-?
Generic notification indicator O 3-
End of optional parameters O 1

Parameter	Type	Length (octets)	Notes
Message type	F	1
Message compatibility information		O	3-?
Parameter compatibility information		O	4-?
Remote operations		O	8-?
Service activation		O	3-?
Call transfer number		O	4-?
Access transport		O	3-?
Generic notification indicator		O	3-
End of optional parameters		O	1

NOTE - Peer-to-peer interworking with an earlier version of ISUP may result in format errors and lead to the release of the call.

DSS1

Information element	Direction	Type	Length
Protocol discriminator	Both	M	1
Call reference	Both	M	2-*
Message type	Both	M	1
Facility	both	M	2-*
Notification indicator		O	2-*
Display	n to u	O	min 2 max 34 v. 82