2.27 Information Request message (INR): A message sent by an exchange to request information in association with a call. Table 31/Q.763 Message Type: Information request (national use) Parameter Reference (subclause) Type Length (octets) Message type 2.1 F 1 Information request indicators 3.29 F 2 Call reference 3.8 O 7 Network specific facility 3.36 O 4-? Parameter compatibility information 3.41 O 4-? End of optional parameters 3.20 O 1