Appendix E. ITU-T Q.931 Messages The table in this appendix summarizes Q.931 messages and the purpose of each. Q.931 is the layer 3 protocol of the subscriber signaling system used for ISDN and is known as Digital Subscriber Signaling System No. 1 (DSS 1). It employs a message set that is made for interworking with SS7's ISDN User Part (ISUP). As such, the message set maps to the ISUP message set. Table E-1. Q.931 Messages Binary Code Message Name Purpose Call Establishment Messages 0 0 0 0 0 0 0 1 Alerting Direction: Called User Network and Network Calling User The called user is being alerted; that is, "the 'B' party's phone is ringing." 0 0 0 0 0 0 1 0 Call Proceeding Direction: Called User Network or Network Calling User Call establishment is taking place and, as such, no more call establishment signaling is accepted. 0 0 0 0 0 1 1 1 Connect Direction: Called User Network and Network Calling User The 'B' party has accepted the call; that is, has "answered the phone." 0 0 0 0 1 1 1 1 Connect Acknowledge Direction: Network Called user or Calling User Network Message sent to indicate that the called user has been awarded the call. If sent to the network by the calling user, the message allows symmetrical call-control procedures. 0 0 0 0 0 0 1 1 Progress Direction: User Network or Network-> User Sent to indicate the progress of a call in the event of interworking or in relation to the provision of in-band information/patterns (for example, announcements). 0 0 0 0 0 1 0 1 Setup Direction: Calling user Network and Network Called User Initial message sent to initiate a call. 0 0 0 0 1 1 0 1 Setup Acknowledge Direction: Called user Network or Network-> Calling User Indicates that call establishment is underway, but additional information might be requested. Call Information Phase Messages 0 0 1 0 0 1 1 0 Resume Direction: User Network Sent request to resume a previously suspended call. 0 0 1 0 1 1 1 0 Resume Acknowledge Direction: Network User Indicates to the user that the request to resume a suspended call has been completed. 0 0 1 0 0 0 1 0 Resume Reject Direction: Network User Indicates to the user that a failure occurred while trying to resume a suspended call. 0 0 1 0 0 1 0 1 Suspend Direction: User Network Sent to request that a call be suspended. 0 0 1 0 1 1 0 1 Suspend Acknowledge Direction: Network User Informs the user that a request to suspend a call has been completed. 0 0 1 0 0 0 0 1 Suspend Reject Direction: Network User Informs the user that a request to suspend a call cannot be completed. 0 0 1 0 0 0 0 0 User Information Direction: User Network and Network User Sent to transfer information to the remote user. Call Clearing Messages 0 1 0 0 0 1 0 1 Disconnect Direction: User Network or Network User When sent by the network, indicates that the connection has been cleared end-to-end. When sent from user to network, it is used to request tear down of an end-to- end connection. 0 1 0 0 1 1 0 1 Release Direction: User Network or Network User Indicates that the channel has been disconnected by the equipment sending the message, and that it intends to release the channel along with the call reference. As a result, the receiving equipment should release the channel and call references after sending a RELEASE COMPLETE. 0 1 0 1 1 0 1 0 Release Complete Direction: User Network or Network User Sent to indicate that the equipment sending the message has released the channel and the call reference. The channel is ready for reuse and the receiving equipment shall release the call reference. 0 1 0 0 0 1 1 0 Restart Direction: User Network or Network User Sent to request that the recipient restarts (returns to idle) the indicated channels or interfaces. 0 1 0 0 1 1 1 0 Restart Acknowledge Direction: User Network or Network User Sent to acknowledge a RESTART message and to indicate that the requested restart has been completed. Miscellaneous Messages 0 1 1 1 1 0 0 1 Congestion Control Direction: Network User or User Network Sent to indicate the beginning or ending of flow control on the transmission of USER INFORMATION messages. 0 1 1 1 1 0 1 1 Information Direction: User - > Network or Network User Provides additional information in the case of overlap signaling for call establishment, for example, or for other miscellaneous call-related information. 0 1 1 0 1 1 1 0 Notify Direction: User Network or Network User Indicates information relating to the call, such as when a user has suspended a call. 0 1 1 1 1 1 0 1 Status Direction: Network User or User Network Indicates the current call state in terms of Q.931 state machine and is sent in response to a Status Enquiry message. Is also used to report certain error conditions at any time during a call. 0 1 1 1 0 1 0 1 Status Enquiry Direction: User Network or Network User Requests a STATUS message, the sending of which is mandatory. 0 1 1 0 0 0 0 0 Segment Used for segmented messages. < Day Day Up > < Day Day Up > GSM MAP Operations Table F-1. GSM MAP Operations Operation Binary Code Location Registration Operations UpdateLocation 0 0 0 0 0 0 1 0 CancelLocation 0 0 0 0 0 0 1 1 PurgeMS 0 1 0 0 0 0 1 1 SendIdentification 0 0 1 1 0 1 1 1 GPRS Location Registration Operations UpdateGprsLocation [3G] 0 0 0 1 0 1 1 1 Subscriber Information Enquiry Operations ProvideSubscriberInfo [3G] 0 1 0 0 0 1 1 0 Any Time Information Enquiry Operations AnyTimeInterrogation [3G] 0 1 0 0 0 1 1 1 Any Time Information Handling Operations AnyTimeSubscriptionInterrogation [3G] 0 0 1 1 1 1 1 0 AnyTimeModification [3G] 0 1 0 0 0 0 0 1 Subscriber Data Modification Notification Operations NoteSubscriberDataModified [3G] 0 0 0 0 0 1 0 1 Handover Operations PerformHandover [P1] 0 0 0 1 1 1 0 0 PrepareHandover 0 1 0 0 0 1 0 0 SendEndSignal 0 0 0 1 1 1 0 1 ProcessAccessSignaling 0 0 1 0 0 0 1 0 ForwardAccessSignaling 0 0 1 0 0 0 1 0 PerformSubsequentHandover [P1] 0 0 0 1 1 1 1 0 PrepareSubsequentHandover 0 1 0 0 0 1 0 1 Authentication Management Operations SendAuthenticationInfo 0 0 1 1 1 0 0 0 AuthenticationFailureReport [3G] 0 0 0 0 1 1 1 1 IMEI Management Operations CheckIMEI 0 0 1 0 1 0 1 1 Subscriber Management Operations SendParameters [P1O] 0 0 0 0 1 0 0 1 InsertSubscriberData 0 0 0 0 0 1 1 1 DeleteSubscriberData 0 0 0 0 1 0 0 0 Fault Recovery Management Operations Reset 0 0 1 0 0 1 0 1 ForwardChecksIndication 0 0 1 0 0 1 1 0 RestoreData 0 0 1 1 1 0 0 1 GPRS Location Information Retrieval Operations SendRoutingInfoForGprs [3G] 0 0 0 1 1 0 0 0 Failure Reporting Operations FailureReport [3G] 0 0 0 1 1 0 0 1 GPRS Notification Operations NoteMsPresentForGprs [3G] 0 0 0 1 1 0 1 0 Mobility Management Operations NoteMmEvent [3G] 0 1 0 1 1 0 0 1 Operation and Maintenance Operations ActivateTraceMode 0 0 1 1 0 0 1 0 DeactivateTraceMode 0 0 1 1 0 0 1 1 TraceSubscriberActivity [P1O] 0 1 0 1 0 0 1 0 NoteInternalHandover [P1O] 0 0 1 1 0 1 0 1 SendIMSI 0 0 1 1 1 0 1 0 Call Handling Operations SendRoutingInfo 0 0 0 1 0 1 1 0 ProvideRoamingNumber 0 0 0 0 0 1 0 0 ResumeCallHandling [3G] 0 0 0 0 0 1 1 0 ProvideSIWFSNumber [3G] 0 0 0 1 1 1 1 1 Siwfs-SignallingModify [3G] 0 0 1 0 0 0 0 0 SetReportingState [3G] 0 1 0 0 1 0 0 1 StatusReport [3G] 0 1 0 0 1 0 1 0 RemoteUserFree [3G] 0 1 0 0 1 0 1 1 Ist-Alert [3G] 0 1 0 1 0 1 1 1 Ist-Command [3G] 0 1 0 1 1 0 0 0 Supplementary Service Operations RegisterSS 0 0 0 0 1 0 1 0 EraseSS 0 0 0 0 1 0 1 1 ActivateSS 0 0 0 0 1 1 0 0 DeactivateSS 0 0 0 0 1 1 0 1 InterrogateSS 0 0 0 0 1 1 1 0 ProcessUnstructuredSsData 0 0 0 1 1 0 0 1 ProcessUnstructuredSsRequest 0 0 1 1 1 0 1 1 UnstructuredSsRequest 0 0 1 1 1 1 0 0 UnstructuredSsNotify 0 0 1 1 1 1 0 1 RegisterPassword 0 0 0 1 0 0 0 1 GetPassword 0 0 0 1 0 0 1 0 BeginSubscriberActivity [P1O] 0 1 0 1 0 1 0 0 SsInvocationNotification [3G] 0 1 0 0 1 0 0 0 RegisterCcEntry [3G] 0 1 0 0 1 1 0 0 EraseCcEntry [3G] 0 1 0 0 1 1 0 1 Short Message Service Operations SendRoutingInfoForSM 0 0 1 0 1 1 0 1 ForwardSM MoForwardSM [3G] 0 0 1 0 1 1 1 0 MtForwardSM [3G] 0 0 1 0 1 1 0 0 ReportSmDeliveryStatus 0 0 1 0 1 1 1 1 NoteSubscriberPresent [P1O] 0 1 0 0 1 0 0 0 AlertServiceCentreWithoutResult [P1O] 0 1 0 0 1 0 0 1 AlertServiceCentre 0 1 0 0 0 0 0 0 InformServiceCentre 0 0 1 1 1 1 1 1 ReadyForSM 0 1 0 0 0 0 1 0 Group Call Operations PrepareGroupCall [3G] 0 0 1 0 0 1 1 1 SendGroupCallEndSignal [3G] 0 0 1 0 1 0 0 0 ProcessGroupCallSignaling [3G] 0 0 1 0 1 0 0 1 ForwardGroupCallSignaling [3G] 0 0 1 0 1 0 1 0 Location Service Operations SendRoutingInfoForLCS [3G] 0 1 0 1 0 1 0 1 ProvideSubscriberLocation [3G] 0 1 0 1 0 0 1 1 SubscriberLocationReport [3G] 0 1 0 1 0 1 1 0 Secure Transport Operations SecureTransportClass1 [3G] 0 1 0 0 1 1 1 0 SecureTransportClass2 [3G] 0 1 0 0 1 1 1 1 SecureTransportClass3 [3G] 0 1 0 1 0 0 0 0 SecureTransportClass4 [3G] 0 1 0 1 0 0 0 1 Key: P1O = Specified for use in MAP Phase 1 only (no longer published). 3G = Found in 3GPP R6 MAP Phase 3 specification [115 ], but not in ETSI MAP Phase 2 [116 ]. . summarizes Q.931 messages and the purpose of each. Q.931 is the layer 3 protocol of the subscriber signaling system used for ISDN and is known as Digital Subscriber Signaling System No. 1 (DSS 1). It. taking place and, as such, no more call establishment signaling is accepted. 0 0 0 0 0 1 1 1 Connect Direction: Called User Network and Network Calling User The 'B' party has accepted. 1 0 1 Handover Operations PerformHandover [P1] 0 0 0 1 1 1 0 0 PrepareHandover 0 1 0 0 0 1 0 0 SendEndSignal 0 0 0 1 1 1 0 1 ProcessAccessSignaling 0 0 1 0 0 0 1 0 ForwardAccessSignaling