Sending ISUP protocol messages

The following table describes the event initialization routines and function combinations used to send various ISUP protocol messages. When applicable, the value required for the evntType argument to the function is shown.

Message type

Mnemonic

Event initialization routine

Function

Address complete

ACM

ISUPInitACM

ISUPConnectStatusReq

evntType = ADDRCMPLT

Answer

ANM

ISUPInitANM

ISUPConnectResp

Application transport message

APM

none

ISUPStatusReq

evntType = APPTRANSPORT

Blocking (not supported by BICC)

BLO

none

ISUPStatusReq

evntType = CIRBLKREQ

Blocking acknowledgment (not supported by BICC)

BLA

none

ISUPStatusReq

evntType = CIRBLKRSP

Call modification complete

CMC

none

ISUPConnectStatusReq

evntType = MODCMPLT

Call modification reject

CMRJ

none

ISUPConnectStatusReq

evntType = MODREJ

Call modification request

CMR

none

ISUPConnectStatusReq

evntType = MODIFY

Call progress

CPG

ISUPInitCPG

ISUPConnectStatusReq

evntType = PROGRESS

Charge information

CRG

none

Unsupported.

Circuit group blocking

CGB

none

ISUPStatusReq

evntType = CIRGRPBLKREQ

Circuit group blocking acknowledgment

CGBA

none

ISUPStatusReq

evntType = CIRGRPBLKRSP

Circuit group query

CQM

none

ISUPStatusReq

evntType = CIRGRPQRYREQ

Circuit group query response

CQR

none

Generated automatically by ISUP task.

Circuit group reset

GRS

none

ISUPStatusReq

evntType = CIRGRPRESREQ

Circuit group reset acknowledgment

GRA

none

Generated automatically by ISUP task.

Circuit group unblocking

CGU

none

ISUPStatusReq

evntType = CIRGRPUNBLKREQ

Circuit group unblocking acknowledgment

CGUA

none

ISUPStatusReq

evntType = CIRGRPUNBLKRSP

Circuit reservation

CRM

ISUPInitCRM

ISUPStatusReq

evntType = CIRRESERVE

Circuit reservation acknowledgment

CRA

none

ISUPStatusReq

evntType = CIRRESERVEACK

Circuit validation response

CVR

none

Generated automatically by ISUP task.

Circuit validation test

CVT

none

isupValidateCircuit

(ISUP management functions)

Confusion

CFN

none

Generated automatically by ISUP task.

Connect

CON

ISUPInitCON

ISUPConnectResp

Continuity

COT

ISUPInitCOT

ISUPStatusReq

evntType = CONTREP

Continuity check request (not supported by BICC

CCR

none

ISUPStatusReq

evntType = CONTCHK

Delayed release

DRS

none

Unsupported.

Exit

EXM

none

Generated automatically by ISUP task.

Facility

FAC

ISUPInitFAC

ISUPFacilityReq

evntType = FACILITY

Facility accepted

FAA

ISUPInitFAA

ISUPFacilityReq

evntType = FACILITYACC

Facility reject

FRJ

ISUPInitFRJ

ISUPFacilityReq

evntType = FACILITYREJ

Facility request

FAR

ISUPInitFAR

ISUPFacilityReq

evntType = FACILITYREQ

Facility deactivate

FAR

ISUPInitFAD

ISUPFacilityReq

evntType = FACILITYDEACT

Facility information

FAR

ISUPInitFAI

ISUPFacilityReq

evntType = FACILITYINFO

Forward transfer

FOT

ISUPInitFOT

ISUPConnectStatusReq

evntType = FRWDTRSFR

Identification request

IDM

none

ISUPConnectStatusReq

evntType = IDENTRSP

Identification response

IDR

none

ISUPConnectStatusReq

evntType = IDENTREQ

Information

INF

ISUPInitINF

ISUPConnectStatusReq

evntType = INFORMATION

Information request

INR

ISUPInitINR

ISUPConnectStatusReq

evntType = INFORMATREQ

Initial address

IAM

ISUPInitIAM

ISUPConnectReq

Loop prevention

LOP

none

ISUPStatusReq

evntType = LOOPPREVENTION

Loopback acknowledgment (not supported by BICC)

LPA

none

ISUPStatusReq

evntType = LOOPBCKACK

Network resource manager

NRM

none

ISUPConnectStatusReq

evntType = NETRESMGR

Overload (not supported by BICC)

OLM

none

Generated automatically by ISUP task.

Pass-along (not supported by BICC)

PAM

 

ISUPDataReq

Pre-release information

PRI

none

ISUPStatusReq

evntType = PRERELEASE

Release

REL

ISUPInitREL

ISUPReleaseReq

Release complete

RLC

none

ISUPReleaseResp

Reset circuit

RSC

none

ISUPStatusReq

evntType = CIRRESREQ

Resume

RES

ISUPInitRES

ISUPResumeReq

Subsequent address

SAM

ISUPInitSAM

ISUPConnectStatusReq

evntType = SUBSADDR

Suspend

SUS

ISUPInitSUS

ISUPSuspendReq

Unblocking (not supported by BICC)

UBL

none

ISUPStatusReq

evntType = CIRUNBLKREQ

Unblocking acknowledgment (not supported by BICC)

UBA

none

ISUPStatusReq

evntType = CIRUNBLKRSP

Unequipped circuit identification code

UCIC

none

Generated automatically by ISUP task.

User part available (not supported by BICC)

UPA

none

Generated automatically by ISUP task.

User part test (not supported by BICC)

UPT

none

Generated automatically by ISUP task.

User-to-user information

USR

none

ISUPDataReq