2.30	Loop Prevention message (LOP): A message sent to convey information required by the ECT supplementary service.
Table 50/Q.763
Message Type:  Loop prevention

Parameter
Reference (subclause)
Type
Length (octets)
Message type
        2.1
F
1
Message compatibility information
        3.33
O
3-?
Parameter compatibility information
        3.41
O
4-?
Call transfer reference
        3.65
O
3
Loop prevention indicators
        3.67
O
3
End of optional parameters
        3.20
O
1