Signaling System No.7 Protocol Architecture And Sevices part 66

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Signaling System No.7 Protocol Architecture And Sevices part 66

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Appendix B. ISUP Messages (ANSI/UK/ETSI/ITU-T) The table in this appendix summarizes ISDN User Part (ISUP) messages and the purpose of each. For an introduction to ISUP, refer to Chapter 8, "ISDN User Part (ISUP)

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Nội dung Text: Signaling System No.7 Protocol Architecture And Sevices part 66

  1. Appendix B. ISUP Messages (ANSI/UK/ETSI/ITU-T) The table in this appendix summarizes ISDN User Part (ISUP) messages and the purpose of each. For an introduction to ISUP, refer to Chapter 8, "ISDN User Part (ISUP)." Table B-1. ISUP Messages Message/Code Full Message Name Purpose ACM Address Complete Sent in the backward direction, indicating that all address signals have 00000110 been received and that the call set-up is progressing. ANM Answer Sent in the backward direction to indicate that the called party has 00001001 answered the call. May be used to trigger billing and measurements of call duration. APM (NI99)(I) Application Sent in either direction to convey Transport application information using the 01000001 Application Transport Mechanism. BLO Blocking Sent to the exchange at the far end to block call originations for the specified 00010011 circuit. BLA Blocking Sent in response to a BLO message, Acknowledgement indicating that the identified circuit has 00010101 been blocked to outgoing traffic. CPG Call Progress Sent in either direction, indicating that an event has occurred in the progress of 00101100 a call. CGB Circuit Group Sent to the exchange at the far end to Blocking block call originations for a specified 00011000 group of contiguous circuits.
  2. CGBA Circuit Group Sent in response to a CGB, indicating Blocking that the identified group of circuits has 00011010 Acknowledgement been blocked to outgoing traffic. CQM (N) Circuit Group Query Sent on a routine or demand basis to (NS67) request the exchange at the other end of [Circuit Query a group of circuits for the state of the 00101010 Message (ANSI)] circuits within the specified range. CQR (N) Circuit Group Query Sent in response to a CQM, indicating (NS67) Response the state of the previously identified group of circuits. 00101011 [Circuit Query Response Message (ANSI)] GRS Circuit Group Reset Sent to align the state of a group of circuits with the state of those circuits as 00010111 perceived by the exchange after releasing any calls in progress, and after removing any blocked condition from that group of circuits. Message is sent when an exchange does not know the particular state of a group of circuits, because of memory problems, for example. GRA Circuit Group Reset Sent in response to a GRS message to Acknowledgement indicate that the group of circuits has 00101001 been realigned. CGU Circuit Group Sent to the exchange at the far end to Unblocking remove the blocked condition for a 00011001 specified group of circuits, allowing call originations to occur. CGUA Circuit Group Sent in response to a CGU, indicating Unblocking that the identified group of circuits is 00011011 Acknowledgement now unblocked. CRM (A) Circuit Reservation Sent in the forward direction only when Message interworking with exchange access 11101010 multi-frequency signaling to reserve a circuit and initiate any required
  3. continuity checks. CRA (A) Circuit Reservation Sent in the backward direction in Acknowledgement response to a CRM, indicating that the 11101001 circuit has been reserved for an outgoing call. CVR (A) Circuit Validation Sent in response to a CVT to convey Response translation information for the indicated 11101011 circuit. CVT (A) Circuit Validation Sent on a routine or demand basis to Test request translation information for the 11101100 identified circuit. CRG (N) (I) Charge Information Information sent in either direction for (NS67) accounting and/or call-charging purposes. 00110001 CFN (NS67) Confusion Sent in response to any message (other than a confusion message) to indicate 00101111 that all or part of a received message was unrecognized. CON (I) Connect Sent in the backward direction, indicating that all of the address signals 00000111 required for routing the call to the called party have been received, and that the call has been answered. COT (NUK) Continuity Sent in the forward direction to indicate the result of the completed continuity 00000101 test. CCR (NUK) Continuity Check Sent to request a continuity check on the Request identified circuit (requests the exchange 00010001 at the circuit to attach continuity checking equipment). EXM (A) Exit Message Sent in the backward direction from an outgoing gateway exchange to indicate 11101101 that the call has successfully progressed to the adjacent network (Intranetwork
  4. use only). FAC (NS67) Facility Sent in either direction at any phase of a call to request an action at another 00110011 exchange. Also used to carry the results, error, or rejection of a previously requested action. FAA (I) (NS67) Facility Accepted Sent in response to a facility request message, indicating that the requested 00100000 facility has been invoked. FAJ (I) (NS67) Facility Reject Sent in response to a facility request message (FAR) to indicate that the 00100001 facility request has been rejected. FAR (I) (NS67) Facility Request Sent from one exchange to another to request activation of a facility. 00011111 FOT (NUK) Forward Transfer Sent in the forward direction on semi- automatic calls when the operator wants 00001000 an operator at a distant exchange to help. IDR (I) (NS67) Identification Sent in the backward direction to request Request an action regarding the malicious call 00110110 identification supplementary service. IDS (I) (NS67) Identification Sent in response to the IDR message. Response 00110111 INF (N) (NS67) Information Sent to convey additional call-related information that may have been 00000100 requested in the INR message. INR (N) (NS67) Information Request Sent by an exchange to request additional call-related information. 00000011 IAM Initial Address Sent in the forward direction to initiate seizure of an outgoing circuit and to 00000001 transmit number and other information related to the routing and the handling of a call.
  5. LPA (N) Loop Back Sent as a response to a CCR to indicate (NS67) Acknowledgement that the requested loop back has been connected (or transceiver in the case of a 00100100 2-wire connection). LOP (I) (NI97) Loop Prevention Sent to convey information required by the ECT (explicit call transfer) 01000000 supplementary service. NRM (I) Network Resource Sent in order to modify network (NS67) (NUK) Management resources associated with a certain call, and sent along an established path in any 00110010 direction in any phase of the call. OLM (N) (I) Overload Sent in the backward direction on non- (NS67) priority calls in response to an initial address message (IAM) to invoke 00110000 temporary trunk blocking of the concerned circuit when the exchange generating the message is subject to load control. PAM (N) Pass-Along Sent in either direction to transfer (NS67) information between two signaling points along the same signaling path as 00101000 that used to establish a physical connection. PRI (I) (NS67) Prerelease Sent with a release message (REL) in (NI99) Information cases where the inclusion of the information in the REL would cause 01000010 compatibility problems with ISUP 1992 and subsequent versions. REL Release Sent in either direction, indicating that the circuit identified in the message is 00001100 being released. RLC Release Complete Sent in either direction as a response to a REL or reset circuit (RSC) message to 00010000 indicate that the circuit has been brought into the idle state.
  6. RSC Reset Circuit Sent when an exchange does not know the state of a particular circuit and wants 00010010 to release any call in progress, remove any remotely blocked state, and align states. RES Resume Sent in either direction to indicate reconnection after being suspended (for 00001110 example, reanswer from an interworking node, or in the case of a non-ISDN, the called party has gone off hook within a certain time after going onhook during the call's active phase). SGM (I) Segmentation Sent in either direction to convey an (NS67) additional segment of an over-length message. 00111000 SAM (I) Subsequent Address May be sent in the forward direction following an IAM to convey additional 00000010 information about the called party number. SDN (N) (I) Subsequent May be sent in the forward direction (NS67) (NI99) Directory Number following an IAM to convey additional information about the called party 01000011 number when the called party number information in the IAM was contained in the Called Directory Number parameter. Typically used in certain number portability scenarios. SUS Suspend Sent in the backward direction to indicate that the called party has been 00001101 temporarily disconnected (for example, a clear back from an interworking exchange, or in case a non-ISDN called party has gone on hook during a call's active state). UBL Unblocking Sent to cancel the blocked condition of a circuit caused by a previously sent BLO
  7. 00010100 message. UBA Unblocking Sent in response to a UBL, indicating Acknowledgement that the identified circuit is now 00010110 unblocked. UCIC (N) Unequipped CIC Sent from one exchange to another when (NS67) it receives a message that contains an unequipped circuit identification code. 00101110 UPA (I) (NS67) User Part Available Sent in either direction as a response to a user part's test message to indicate that 00110101 the user part is available. UPT (I) (NS67) User Part Test Sent in either direction to test the status of a user part that is marked as 00110100 unavailable for a signaling point. USR (I) (NS67) User-to-User Used for transport of user-to-user Information signaling, independent of call-control 00101101 messages. KEY: Note that the absence of a symbol beside a message indicates that the message exists in ITU-T ISUP [75–78], ETSI ISUP [18] and in ANSI ISUP [2]. • (A)— Messages supported in ANSI ISUP [2]only • (I)— Messages not supported in ANSI ISUP [2] • (N)— Messages designated by the ITU-T for national use • (NUK)— Messages not supported by UK ISUP [41] • (NS67)— Messages not supported in ITU-T international ISUP • Q.767 [81] (NI99)— Messages new in ITU-T ISUP 1999 • (NI97)— Messages new in ITU ISUP 1997  
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