- The user application must call this routine to receive events (messages) from the ISUP layer.
- If a message is received, ISUPRetrieveMessage copies the event to the caller's event buffer, performing any necessary byte order translation to convert to the host PC's native byte ordering. Information relative to the event is returned to the caller in the infoBlk parameter.
- The structure of the receive information block is as follows:
typedef struct rcvInfoBlk
{
U8 indType; /* ind confirm. type */
U8 evntType;
/* event type for status & connection status */
/* indications */
SuId suId; /* service access point (SAP) id-all */
SiInstId suInstId;
/* caller's reference number-all */
SiInstId spInstId;
/* ISUP's reference number-all */
CirId circuit;
/* circuit id - all */
Bool globalFlg
/* global/circuit specific flag - status ind.
/* only */
U8 spare; /* filler for future use */
} IsupRcvInfoBlk;
- The indication type (indType) identifies the event received and is coded to one of the following values:
EVTSITCONCFM 0x0D /* Connect confirm */
EVTSITCONIND 0x0E /* Connect indication */
EVTSITDATIND 0x16 /* Data indication */
EVTSITSUSPIND 0x3A /* Call suspend indication */
EVTSITRESMIND 0x36 /* Call resume indication */
EVTSITCNSTIND 0x5A /* Connection status indication */
EVTSITRELIND 0x5E /* Connection release indication */
EVTSITRELCFM 0x5D /* Connection release confirmation */
EVTSITFACIND 0x6A /* Call facility indication */
EVTSITSTAIND 0x7A /* Status indication */
- The evntType identifies the actual message received for status and connection status indications. It is coded to one of the following values:
For Connection Status Indications
ADDRCMPLT Address Complete
MODIFY Call Modification Request
MODCMPLT Call Modification Complete
MODREJ Call Modification Rejected
PROGRESS Call Progress information
FRWDTRSFR Forward Transfer
IDENTREQ Identification Request
IDENTRSP Identification Response
INFORMATION Information (response to INFORMATREQ)
INFORMATREQ Information Request
SUBSADDR Subsequent Address Message
NETRESMGR Network Resource Manager
For Status Indications
REATTEMPT Reattempt Indication
ERRORIND Error Indication
CONTCHK Continuity Check
CONTREP Continuity Report
STPCONTIN Stop Continuity Indication
LOOPBCKACK Loop Back Acknowledge
CONFUSION Confusion Indication
CIRRESERVE Circuit Reservation Request
CIRRESERVEACK Circuit Reservation Acknowledge
CIRGRPQRYRSP Circuit Group Query Response
CIRBLKREQ Circuit Block Request
CIRBLKRSP Circuit Block Response
CIRUNBLKREQ Circuit Unblock Request
CIRUNBLKRSP Circuit Unblock Response
CIRRESREQ Circuit Reset Request
CIRGRPBLKREQ Circuit Group Block Request
CIRGRPBLKRSP Circuit Group Block Response
CIRGRPRESACK Circuit Group Reset Acknowledge
CIRGRPUNBLKREQ Circuit Group Unblock Request
CIRGRPUNBLKRSP Circuit Group Unblock Response
CIRUNEQPD Circuit Unequipped Indication
MTPPAUSE Pause indication received from MTP
MTPRESUME Resume indication received from MTP
RMTUSRUNAVAIL Remote user unavailable
RMTUSRAVAIL Remote user available
MTPCONGEST Congestion indication received from MTP
MTPSTOPCONGEST Stop congestion indication received from MTP
CIRGRPSET Circuit group set status
CIRGRPGET Circuit group get status
MTPBACKUP BACKUP received from MTP
MTPPRIMARY PRIMARY received from MTP
MTPSTANDALONE STANDALONE received from MTP
For Facility Indications
FACILITY facility
FACILITYREQ facility request
FACILITYACC facility accept
FACILITYREJ facility reject
FACILITYDEACT facility deactivate
FACILITYINFO facility information
Note: The service provider instance id (spInstId) field from the first event received from the ISUP for each connection must be saved by the user application and used in subsequent requests associated with that connection.
- The following NTT-specific value may be received in the evntType member of the IsupRcvInfoBlk for indType equal to EVTSITCNSTIND:
- CHARGE Charge Message
- The event structure associated with a received message depends on the type of message received from the ISUP layer (as determined by the value of the infoBlk.indType field).
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