2.44	User Part Available message (UPA): A message sent in either direction as a response to a user part test message, to indicate that the user part is available.
2.45	User Part Test message (UPT): A message sent in either direction to test the status of a user part marked as unavailable for a signalling point.
Table 44/Q.763
Message Type:   User part test
        User part available

Parameter
Reference (subclause)
Type
Length (octets)
Message type
        2.1
F
1
Parameter compatibility information
        3.41
O
4-?
End of optional parameters
        3.20
O
1