ISUP
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Transcript of ISUP
ISUPISUP
ISUP in the SS7 protocolISUP in the SS7 protocol
MTP Layer 1
MTP Layer 2
MTP Layer 3
TCAPTUP
INAP/AIN
IS41/MAP
SCCP
ISUP
? ?
ISUP CallISUP Call
ISUP phone callISUP phone call
IAM
ACM
ANM
REL
RLC
Contains called party number
Indicates that called party is being alerted
Call has been answered
Caller has gone on hook
This circuit has been released
SSP SSP
STP
Routing label formatRouting label format
1st bit transmitted
14-bit point code format:
SIODPCOPCSLS
8 bits14 bits14 bits8 bits
CICMsg type
4 bits12 bits
4 spare bits
SIO - signalling information octet
DPC - destination point code
OPC - originating point code
SLS - signalling link selection
CIC - circuit identification code
Connect messageConnect message
IAM
CON
REL
RLC
SSP SSP
STP
Overlap sendingOverlap sending
IAM
ACM
ANM
REL
RLC
SAM
SAM
SSP SSP
STP
Suspend and resumeSuspend and resume
IAM
ACM
SUS
ANM
RES
Call is still in speech
SSP SSP
STP
ResetReset
RSC
RLC
GRS
GRA
Resets one circuit
Resets a group of
circuits
SSP SSP
STP
Reset during a callReset during a call
IAM
ACM
RSC
RLC
ANM
SSP SSP
STP
BlockingBlocking
BLO
BLA
CGB
CGBA
Maintenance blocks
one circuit
Hardware or maintenance
blocks a group of circuits
SSP SSP
STP
UnblockingUnblocking
UBL
UBA
CGU
CGUA
Maintenance unblocks
one circuit
Hardware or maintenance unblocks a group of circuits
SSP SSP
STP