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SCCP/SCCPb

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Objectives

On completion this mo!le" the st!ent #ill $e a$leto%

& 'ive e(amples o) SCCP services an )!nctions!se in 'SM/3'

& *(plain the complete messa+e str!ct!re o) a SCCPmessa+e

& Interpret printo!ts o) the SCCP messa+es& O!tline the main principles o) SCCP mana+ement

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SCCP services

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SCCP

SCCP Users

SCCP connectionlesscontrol

SCCP RoutingSCCP Management

SCCP ConnectionOriented Control

MTP

MTP - PAUSEMTP - RESUME

MTP - STATUS

SSASSPSST

UDT, UDTS

CR, CC,

CREF,RLSD,RLC, DTI,

ERR, IT

N- UNITDATA req.

MTP Transfer req.

MTP Transfer ind.

N- UNITDATA ind.

N- CONNECT req.

N-CONNECT ind.

Functional structure of SCCP

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Message Service

typeDescription

UDT 0,1 Unitdata

UDTS 0,1 Unitdata Service. Used to indicate to the originating SCCP that a UDT cannot be delivered to

its destination.

XUDT 0,1 Etended Unitdata. Used to send data along !ith optional para"eters.

XUDTS 0,1 Etended Unitdata Service. Used to indicate to the originating SCCP that an XUDT cannot be

delivered to its destination.

#UDT 0,1 #ong Unitdata. Used to send data along !ith optional para"eters over MTP$b %&.''10(. Up to

$)*' octets !itho+t seg"entation are allo!ed.

#UDTS 0,1 #ong Unitdata Service. Used to indicate to the originating SCCP that an #UDT cannot be

delivered to its destination.

SCCP connectionless servicemessages

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Message Servicetype

DescriptionCC ',$ Connection Conir"

C- ',$ Connection -e+est

C-E/ ',$ Connection -e+sed

$ Data ac2no!ledge"ent. Used to control the !indo! lo! control "echanis" selected or the data

transer phase.

DT1 ' Data /or" 1

DT' $ Data /or" '

ED $ Epedited Data. Si"ilar to DT' b+t it can bypass the lo! control "echanis".

E $ Epedited Data ac2no!ledge"ent. Every ED "essage "+st be ac2no!ledged !ith E "essage

beore another ED is sent.

3T ',$ 3nactivity Test. Sent periodically to chec2 i the connection is still active at both ands and to a+dit

the consistency o data.

E-- ',$ Protocol Data Unit Error. Sent on detection o the SCCP protocol error.

-#SD ',$ -elease

-#C ',$ -elease Co"plete

-SC $ -eset Conir".

-S- $ -eset -e+est. 3ndicates that the SCCP needs to reset the se+ence n+"bers.

SCCP connection orientedservice messages

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ASN-1 coding principle

Parameter

Code

Parameter ContentParameter

Length

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SCCP message structure

8 7 6 ! " # $

T$$787#%-&6

Order 'f '()e) rans*issi'n

anda)'r+ i,ed ar)

anda)'r+ .aria/0e ar)

O)i'na0 ar)

Messa1e )+e ('de

Manda)'r+ ara*e)er A

Manda)'r+ ara*e)er F P'in)er )' ara*e)er M

P'in)er )' ara*e)er P P'in)er )' s)ar) 'f ')i'na0 ar)

Len1)2 indi(a)'r 'f ara*e)er M

Para*e)er M

Len1)2 indi(a)'r 'f ara*e)er P

Para*e)er P

Para*e)er na*e 3 4

Len1)2 indi(a)'r 'f ara*e)er 4

Para*e)er 4

Para*e)er na*e 3 5 Len1)2 indi(a)'r 'f ara*e)er 5

Para*e)er 5

End 'f ')i'na0 ara*e)ers

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MTP

P2+si(a0

SCCP

F C6 SIF SIO LI CRC F MSU

Da)a

User

Ca00in1

Address

Ca00ed

Add.P'in)er )'

User Da)aP'in)er )'

Ca00in1 Add.

P'in)er )'

Ca00ed Add.

Pr')'('0

C0assMessa1e

C'de

R'7)in1

La/e0

SCCP message example - !"

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SCCP message example - !"

Para"eter Type #ength

%octets(

4al+e

Message type Mandatory ied part 1 0)

Protocol class Mandatory ied part 1 0 or 1

Called party address Mandatory variable

part

' "ini"+"

Calling party address Mandatory variable

part

' "ini"+"

Data Mandatory variable

part

'5Xa(

a( D+e to the ongoing st+dies on the SCCP called and calling party address, the "ai"+" length o

this para"eter needs +rther st+dy. 6ote that the transer o +p to '** octets o +ser data is allo!ed

!hen the SCCP called and calling party address do not incl+de global title.

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SCCP parameters and code

Para"eter 6a"e Code %7e(

Destination #ocal -eerence 01

So+rce #ocal -eerence 0'

Called Party ddress 0$

Calling Party ddress 08

Protocol Classes %0 to $( 0*

Seg"enting9 -easse"bling 0:

Se+encing9Seg"enting 0;

Credit 0)

Error Ca+se 0D

Data 0/

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& INAP !ses onl connectionless services o) SCCP& INAP !ses service class 1& 4nitata 54678 messa+e is !se normall& *(tene 4nitata 594678 is !se #ith SCCP

se+mentation& 467/9467 is pac:e into the SI; in the MS4 o) thM7P& 7he val!e o) Messa+e 7pe )or 467 is 0000 1001& 7he val!e o) Messa+e 7pe )or 9467 is 0001 000

Structure of a !" message

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& INAP !ses protocol class as )ollo#s% < Service class - 3 2 1 0 0 0 1 SCCP service class 1" se=!ence +!aran

< Messa+e hanlin+ 5controlle $ >M;I?8 0 0 0 0 6iscar messa+e on error 1 0 0 0 @et!rn messa+e on error

Protocol class

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;ormat o) the Callin+PartAress anCallePartAress

SCCP address coding

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INAP !ses '7 as )ollo#s% < 7ranslation tpe 00000000 SCP 00000001 A n!m$er 00000010 n!m$er < N!m$erin+ plan 0001 *.1- < *ncoin+ scheme 0001 C6 coe" o 0010 C6 coe" even I) 77 not 0" '7 translation chan+es it $ac: to 0

< Nat!re o) aress inicator 0000011 National 0000100 International< Spare 0 Not !se

< Aress si+nals C6 coe aress i+its 50

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SCCP connection setup - CONS

OP

SCCPUser Par)

CONNECT

8req7es)9

CR

CONNECT

8('nfir*9

DT$

DISCONNECT8req7es)9

DT$

RLSD

STP

SCCP

CR

CC

DT$ DT$

RLSD

RLC

DPUser Par) SCCP

CONNECT

8indi(a)i'n9

CC CONNECT

8res-'nse9

DISCONNECT8indi(a)i'n9

RLC

C'nne()

Da)a

R

e0ease

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SCCP connection - C)NS

OP

User Par) SCCP

Uni) Da)a

8req7es)9

UDT

Uni) Da)a

8('nfir*9

STP DPC

SCCP 'f STP

UDT

UDT

Uni) Da)a

8indi(a)i'n9

UDT

Uni) Da)a

8res'nse9

UDT

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BSSAP MAP INAP

RI = T

A!!lication !arts

SCCP

MTP

S3> ? SCCP

T Anal"sis

>ther DPC

Discrimination

DPC = o#n SPC

Routing

Distri$ution

DPC is not o#n SPC

-3RI = SSN

DPC>!n SPC

SS6

SCCP message routing

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*oaming contract example

MSC51

7#-51

MSC5'

7#-5'

... ...

60 60360 or 61

PST6

P#M651 P#M65'Phoneland 3ndia

("+ ,,1--.-

("+ ,,1--/-

("+ 010,--,,

("+ 010,2--11

*e istered %#S%+s

----xxxxxxxxxx

*e istered %#S%+s...3--1xxxxxxxxxx

Fin

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SCCP management messages&SC#('

Message Description

SS S+bsyste" llo!ed

S>@ S+bsyste" >+t > Service @rant

S>- S+bsyste" >+t > Service -e+est

SSP S+bsyste" Prohibited

SST S+bsyste" Stat+s Test

SSC S+bsyste" Congested

Documents

190937619-SCCP