Protocol: SS7 - ITU-SCCP

SS7 - ITU-SCCP protocol

The following table provides a summary of the SCCP messages structure included in this page:

Message format	ITU-Q713
List of Messages types.	ITU-Q713
List of messages Parameters	ITU-Q713
List of time-limits	ITU-Q713
List of Primitives of Service	ITU-Q713

Octets 1-4:	Label
bits 14-1	DPC: Destination Point Code
bits 28-15	OPC: Origine Point Code
bits 32-29	SLS: Signalling Link Selection
Octets 5-6:	CIC
bits 8-1	Circuit Identification Code (8 LSB)
Octet 5:	Message type code
bits 8-1	Type
Octets 6-l:	Mandatory fixed part
	Parameter A
	Parameter ...
	Parameter F
Octets m-p:	Mandatory variable part
	Pointer to parameter M
	Pointer to parameter ...
	Pointer to parameter P
	Pointer to start of optional part
	Length indicator of parameter M
	Parameter M
	...
	Length indicator of parameter P
	Parameter P
Octets q-z:	Optional part
	Parameter name=X
	Length indicator of parameter X
	Parameter X
	...
	Parameter name=Z
	Length indicator of parameter Z
	Parameter Z
	End of optional parameters

Code	Type	Signalling Connection Control Part
01	CR	Connection Request
02	CC	Connection Confirm
03	CREF	Connection Refused
04	RLSD	Released
05	RLC	Released Complete
06	DT1	Data Type 1
07	DT2	Data Type 2
08	AK	Data Acknowledgement
09	UDT	Unit Data
0A	UDTS	Unit Data Service
0B	ED	Expedited Data
0C	EA	Expedited Data Acknowledgement
0D	RSR	Reset Request
0E	RSC	Reset Confirm
0F	ERR	PDU Error
10	IT	Inactivity Test

Type	Code	Signalling Connection Control Part
AK	08	Data Acknowledgement
CC	02	Connection Confirm
CR	01	Connection Request
CREF	03	Connection Refused
DT1	06	Data Type 1
DT2	07	Data Type 2
EA	0C	Expedited Data Acknowledgement
ED	0b	Expedited Data
ERR	0F	PDU Error
IT	10	Inactivity Test
RLC	05	Released Complete
RLSD	04	Released
RSC	0E	Reset Confirm
RSR	0D	Reset Request
UDT	09	Unit Data
UDTS	0A	Unit Data Service

Hexa	SCCP Parameters type
00	End of optional parameters
01	Destination local reference
02	Source local reference
03	Called party address
04	Calling party address
05	Protocol class
06	Segmenting/reassembling
07	Receive sequence number
08	Sequencing/segmenting
09	Credit
0A	Release cause
0B	Return cause
0C	Reset cause
0D	Error cause
0E	Refusal cause
0F	Data

Hexa	SCCP Parameters type
03	Called party address
04	Calling party address
09	Credit
0F	Data
01	Destination local reference
00	End of optional parameters
0D	Error cause
05	Protocol class
07	Receive sequence number
0E	Refusal cause
0A	Release cause
0C	Reset cause
0B	Return cause
06	Segmenting/reassembling
08	Sequencing/segmenting
02	Source local reference

	Primitives

updated: 27-Feb-04