Session initiation user data field

The address of this user data field is passed to the exit routine in the initial authorization function (function code X'00') parameter list and the ALS selection function (function code X'08') parameter list. This word points to a data field that contains user data specified by the originating resource and carried by the session initiation request.

The format of the session initiation user data field is shown in Table 1.

Note: Do not confuse this field with the user data field described in User data field.

Table 1. Format of session initiation user data field
	Dec (Hex) Offset	Size (Bytes)	Description
	0 (0)	1	Total length of the session initiation user data
	1 (1)	Up to 255	Session initiation user data