IMS Basic Signaling Procedure (SIP&IMS Procedures)

7/18/2019 IMS Basic Signaling Procedure (SIP&IMS Procedures)

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IMS Basic Signaling

Procedure


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References

"#$ $olution #anual % &asic $ignaling rocedure 'olume


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Objectives

)pon completion o* this course, you will +e a+le to

-escri+e the +asic $" concepts and $" +asic procedure.

-escri+e the +asic registration procedure on the "#$ networ.

-escri+e the +asic session procedure on the "#$ networ.


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Contents

1. SIP Overview

2. "#$ egistration and elated rocedures

!. "#$ $ession and elated rocedures


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Contents

. $" 3verview

1.1 SIP Overview

.2 $" #essage $tructure


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Origination and Developent of SIP

The $" was originated in the #+one 5multicast +ac+one6e7periment in 991.

"n 999, the $" was de*ined +y the "8T:##)$"C in C2/(!.

"n 999, the "8T:##)$"C +ecame the independent $" tas *orce.

Later, two $":centered tas *orces, namely, $"";< and $"#L8,

were added.

"n =uly, 2002, the $" was de*ined in the new C!21.

#ost contents are rewritten and clearer. "n addition, certain new

*eatures are added.

#ost contents are +acward:compati+le with C2/(!.


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!"at#s SIP$

$" $ession "nitiation rotocol

$etting up, controlling and tearing down sessions

$" is an "8T protocol *or multi:media sessions

$essions including te7t, video, voice, etc.

$" is one o* the "nternet protocol

Te7t +ased lie HTT

e?uest@eply protocol

idely used *or success*ul "nternet

Can +e +ased on )-@TC@$CT, most o* the case now use )-


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Session Related Protocols

$ignaling protocol

Begistration, user locating, and routing

B$ession esta+lishment, modi*ication, and release

#edia transport protocol

BTransmission o* voice and video

$" % signaling protocol

$ession description 5$-6 is separated *rom session management

5$"6.


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Siplified SIP %etwor& 'rc"itecture

$" e?uest $" e?uest

#edia $tream 5T6

(ser 'gent

)Server*

eceives $"

e?uests

Re+uest Pro,- Server

-etermines here to $end

the $ignaling #essages

(ser 'gent)Client*

$ends $"

e?uests

$" esponse$" esponse


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ogical /ntities of SIP

$" use client@server architecture

Logical $" entities are

)ser Agents 5)A6 )ser Agent Client 5)AC6

"nitiates $" re?uests

)ser Agent $erver 5)A$6

eturns $" response

&oth )AC and )A$ can

terminate a call

egister #aintains the location o* $"

users, sip clients needs to update the

location using register re?uest

ro7y decides ne7t hop and *orwards

re?uest edirect Accepts $" re?uest and

translates to new address

;etwor $ervers


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Contents

. $" 3verview

. $" 3verview

1.0 SIP Message Structure


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The $" consists o* three parts

#essage type

#essage structure

#essage parameter

SIP Message Structure


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Message -pes

$" messages can +e classi*ied into two types

e?uest

"nitiates a session.

esponse

esponds to a re?uest.


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SIP Message -pe 22 Re+uest

Basic Re+uest /,tended Re+uest

I%3I/4to initiate a session

'C5 the response o* ";'"T8

C'%C/ to cancel a session

B6/ to terminate a session

R/7IS/R to register in a server

OPIO%S *or ?uerying servers

a+out their capa+ilities

M/SS'7/ is applied to "#

S(BSCRIB/ to su+scri+e to a noti*y event

%OI86 to send a noti*y event (PD'/ to modi*y the session attri+utes at

the esta+lishment stage o* a call

P(BIS9 to distri+ute its event state to the

status server

PR'C5 to indicate the relia+ility o* a

temporary response


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SIP Message -pe 22 Response

$" response type 1,,4rovisional :: re?uest received, continuing to process the

re?uest

0,,4$uccess :: the action was success*ully received, understood, and

accepted :,,4edirection :: *urther action needs to +e taen in order to

complete the re?uest

;,,4Client 8rror :: the re?uest contains +ad synta7 or cannot +e

*ul*illed at this server


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SIP Basic 8low

Session setup

Client ' Pro,- ' Pro,- B Client B

I%3I/ I%3I/

I%3I/1>> R6I%7

1>> R6I%7

1?> RI%7I%7

1?> RI%7I%7

1?> RI%7I%70>> O5

0>> O5

0>> O5

Registration

Client ' Pro,- '

Register

;>1 unaut"ori@ed

Register

0>> O5

1>> R6I%7


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SIP Message Structure

$" is a Te7t:

+ased protocol

and comprise

+y ! parts

e?uest:Line

Header

&ody


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SIP 9eader 8ields

I%3I/ sip4==>>>0A11.1=.1.11> SIP0.>8ro4 Dsip((/0000E9.19..1FtagGcc+1d*!

o4Dsip11/00002E9.19..0F

CSe+4 ";'"T8

Call2ID42094!e(9*4c/29!4*c1+e22(*9e/2/(!Es7!000

3ia4$"@2.0@)- server9.e7ample.com+ranchG9h


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SIP 9eader 8ields

T3 the target o* this re?uest

3# the logical identity o* the initiator o* the re?uest

Cse? command se?uence ;o., uni?ue in the Call:"- range

Consists o* a se?uence num+er and a method

The $" method must +e the same as that carried in the

re?uest.

Call:"- A glo+ally uni?ue identi*ier . Call:"- and tags are usedto identi*y a dialog.

'ia "denti*ies the route *or the response. The 3ia*ield

prevents loops in the message trans*er and ensures that the

re?uest and response *ollow the same path.

The 3ia*ield must contain the branc"parameter to identi*y

the transaction.

ecord:oute "t is added +y a pro7y in a re?uest to

*orce su+se?uent re?uests in the session to +e routed

through the pro7y. "t is used to create the Routeheader

*ield in su+se?uent re?uests.

oute "t is used to *orci+ly route a re?uest through the

listed set o* pro7ies.

Contact "t provides an address *or direct communication

with the user. "t is present in ";'"T8, ACI, and

8!5too many hops6. "t is used in re?uest messages only.


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SIP /,tension 9eader

R/7IS/R sip registrar.bplace.co SIP0.>

'ia $"@2.0@)- >.24.2.02 0221+ranchG9h(0d0w

'ia $"@2.0@)- >.24.22.22( /01+ranchG9h

P2'ccess2%etwor&2Info !.24.2.02K

P2C"arging23ector

icid:valueGK>.24.2.02.!!(>(1/999.!/4.(K

Call:"- 249((>/E>.24.22.22(

C$e? >21 8


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Soe /,tension 9eader /,aples in IMS

/,tension 9eader/,aples

8unction

:Access:;etwor:"n*o "s used +y the $" )A to trans*er access networtechnologies to the service pro7y

:'isited:;etwor:"- "s used to relay the identi*ication o* the visited domain to theregistrar and pro7y in the home realm

:Charging:'ector Cooperates with the :Charging:unction:Address header*ield to trans*er charging in*ormation over the networ

:Asserted:"dentity ormally indicate the calling party "-

$ervice:oute )sed to in*orm the $:C$C " *or :C$C during egister

ath )sed to in*orm the :C$C " *or $:C$C during egister


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SDP /,aple )/,planations of

Related Paraeters*

SDP

Paraeter

Paraeter

%aeRear&s

v 'ersion num+er vG0

o 3rigin containingnameoGDuser nameF Dsession idF DversionF DnetwortypeF Daddress typeF DaddressF

s $u+ect

c Connection Connection " address50.21.1.0>6

t Time tGDstart timeF Dstop timeF

m #edia #edia *ormat 5audio6 ort num+er54!1>6

a Attri+ute #edia encoding 5C# A Law6 $ample rate 5>000H6

vG0oGHuawei$o*tJ!000 >1> >1> "; "( 0.21.9.200

sG$ip Call

cG"; "( 0.21.1.0>

tG0 0

mGaudio 4!1> T@A' >

aGrtpmap > C#A@>000


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Contents

. $" 3verview

0. IMS Registration and Related Procedures

!. "#$ $ession and elated rocedures


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IMS (ser Registration Procedure

$:C$C

H$$

:C$C

":C$C

(/

Register

Register

Register


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Contents

2. rocedures elated to "#$ egistration

0.1 Local :C$C discovery

2.2 $erving C$C assignment

2.! egistration procedure


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P2CSC8 Discover-

$:C$C

H$$

:C$C

":C$C

(

/

Register

Register

Register


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Pro,- CSC8 Discover-

ro7y:C$C discovery

The procedure o* )8 getting to now the address o* :C$C.

"n order to communicate with "#$ networ, )8 must now at least "

address o* :C$C.

! ways *or :C$C discovery


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P2CSC8 Discover-

IP


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Contents


2. rocedures o* Local :C$C -iscovery

0.0 Procedures of S2CSC8 'ssignent

2.! egistration rocedures


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S2CSC8 'ssignent

$:C$C

H$$

:C$C

":C$C

(

/

Register

Register

Register


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S2CSC8 'ssignent

hen a user is registered with the networ *or accessing the "#$ service,the ":C$C allocates an $:C$C to the )8.

The ":C$C communicates with the H$$ +y using the C7 inter*ace to o+tain

the in*ormation re?uired *or selecting an $:C$C.

"* the H$$ returns the name o* an $:C$C, the ":C$C checs the "

address o* the $:C$C +y using the $:C$C name returned +y the

H$$.

* the H$$ returns the capa+ility set o* an $:C$C, the ":C$C e7ecutes

an algorithm according to the capa+ility set o* each received $:C$C to

select an appropriate $:C$C.


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S2CSC8 'ssignent

":C$C selects the $:C$C according to their capa+ilities Capa+ility "- and meaning is de*ined +y the operator.

Service nae Capabilit- ID

eergenc-call 1

SIP e,tendingfunction 1 0

SIP e,tendingfunction 0

:

E E

I2CSC8P2CSC8

S2CSC8:

S2CSC80

S2CSC81

Subscribe info of user14

Mandator- Capabilit- 1F0F:F;

Optional Capabilit-


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Contents


2. rocedures o* Local :C$C -iscovery

2.2 Procedures of S2CSC8 'ssignent

0.: egistration rocedures


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Related Concepts of Registration Procedures

hy registration is re?uired

)sers use "#)s 5$" )"s6 *or communication.

Current " address o* users are mapped to "#)s.

The in*ormation a+out the locations and service capa+ilities o* users can +e o+tained.

Authentication and authoriation during registration ensures networ security.

Home networ and the visited networ

Home networ the operator where the userMs in*ormation su+scri+ed

'isited networ when user accesses to the networ +y other operators, these operator are

called visited networ.

"n "#$ networ, the registration procedures are the same no matter user accesses *rom the

home networ or visited networ.


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Initial Register in 9oe or 3isited %etwor&

9oenetwor&

);

*

)


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'ut"entication

Authentication is a method used to identi*y a user and ensure the validity o* the user.

The home networ authenticates users +y using the user initial registration procedure.

hen a user terminal initiates initial registration, the $:C$C authenticates the

terminal according to the header *ield carried in the egister message and the

authentication mode selected when the user is de*ined on the H$$.

Currently, the HTT -igest authentication mode is adopted *or *i7ed terminals. That

is, the authentication is per*ormed on the +asis o* user names and passwords.

Authentication and authoriation during registration ensures networ security.

Related Concepts 2 'ut"entication


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Related Concepts H Service Profile

$ervice pro*ile is the set o* service and user related data.

&asic "#$ service pro*ile consists o* charging address setting, +loc

setting, registration authority setting, roaming authority setting,

su+scription media "-, iC, and $:C$C capa+ility set.

iC is used *or $C$C to trigger the service re?uest to A$.

$tore in H$$, and downloaded +y $C$C during the register.

i8C1

Service

Profile

i8C0

i8C:

Bloc&

setting

Registration

aut"orit-

Roaing

aut"orit-

!"ic" 'S will "andle t"e :rd

part- register$

!"ic" 'S)s* will "andle t"e

caller side services$

!"ic" 'S)s* will "andle t"e

called side services$i8C n

EE


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Ot"er Related Concepts

"mplicit egistration hen one "#" is associated with multiple "#)s which are in the same "$,

the registration o* all the "#)s in the "$ can +e implemented through the

"#$ registration o* one "#). This is called implicit registration.

Third:arty egistration

"* a user has su+scri+ed to "#$ services, a*ter the user is registered

success*ully, the $:C$C checs the downloaded iC and triggers the route to

the A$ which serves the user.


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Registration Procedure

0 0ndregister essage

)1>*Register

)10*Register

)1;*Register

)1> O5

)1G*0>> O5

)1?*0>> O5

$:C$C:A

H$$:A

":C$C:A

:C$C:A

":C$C:A

)1:*'ssign S2CSC8

(

/

1 Initial register essage

)1*Register

):*Register

)


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Diaeter Message

Message /,planation

)A )ser Authoriation e?uest

)AA )ser Authoriation Answer

#A #ultimedia Authentication e?uest

#AA #ultimedia Authentication Answer

$A $erver Assignment e?uest

$AA $erver Assignment Answer


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unctions o* ;8s -uring egistration The *ollowing ta+le descri+es the *unctions o* the main ;8s during the registration

%/ 8unction

C$C

:F Checing the "#", "#), and home domain

:F Nuerying the -;$ to o+tain the ":C$C " address

+ased on the home domain and *orwarding the initial

registration re?uest

"C$C

:F Nuerying the H$$ to select an $:C$C and speci*ying

the $:C$C

:F orwarding the registration re?uest to the $:C$C

$C$C

:F -ownloading authentication data *rom the H$$ to

authenticate the terminal

:F -ownloading the service su+scription data 5service

ro*ile o* the user *rom the H$$


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Stored Inforation

%ode Before

Registration

During Registration 'fter Registration

)8

"#", "#),

Credentials

Home -omain

ro7y ;ame@Address

$ame as +e*ore registration "#","#), Credentials

Home -omain

ro7y ;ame@Address

C$C

5in Home or'isited networ6

-;$ address ":C$C address@name

)8 Address "#" "#)

inal ;etwor 8ntry point

)8 Address, "#" "#)$:C$C address

":C$C

5in Home

networ6

H$$ address $:C$C address@name

5temporary6

;o $tate "n*ormation

$:C$C5in Home

networ6

H$$ address H$$ Address@name

)ser pro*ile:C$C address@name

:C$C ;etwor "-

)8 " Address, "#" "#)

#ay have session state

"n*ormation $ame as duringregistration

$ervice pro*ile

:C$C address

H$$ )ser $ervice ro*ile C$C ;etwor "- $:C$C address@name


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De2registration Procedures

)8 initiated de:registration

;etwor initiated de:registration

H$$ initiated the de:registration procedures +e*ore the register timer e7pires

A$ initiated the de:registration procedures +e*ore the register timer e7pires

The register timer e7pires, networ initiated the de:registration procedures


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(ser Initiate t"e Deregister

$witch o** the )8

oaming handovercause


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S2CSC8 Initiate t"e Deregister

The $:C$C needs to +e shut down.

The user is a owing su+scri+ercause


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Contents

. $" 3verview


:. IMS Session and Related Procedures


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Session Procedure Related %etwor& %odes

(/ Main 8unctions

:C$C Caller part the st contact point to access to the "#$

2 Callee part :C$C *orwards the messages to the callee

$:C$C ealie the call control *unction *or +oth caller part and callee part

":C$C Contact point to access to the calleeMs home networ .

A$ "mplement service *or +oth caller and callee side.

-;$@

8;)#

-;$ eply the "C$C " address *or $:C$C ?uery

8;)# #ap the T8L *ormat "#) to $")" *ormat

H$$ 3nly used in the callee part. ":C$C locate the $C$C +y ?uery the

H$$


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Procedures Involved in a Session

Procedures involved in t"e

session

Sessionestablis"ent

procedure

Media

negotiation

procedure

Resource

reservation

procedure

'pplication

service

session

procedure

Sessionrelease

procedure

$ession procedure o* the application service

"n the session procedure, the A$ processes the

corresponding service. "n the +asic call procedure,

no A$ is involved.


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rom the $:C$C@A$

where the callee )8

registered to the callee

)8

rom the $:C$C@A$where the callee )8

registered to the callee

)8

rom the $:C$C@A$

in the caller part to the

$:C$C@A$ in the

callee part

rom the $:C$C@A$in the caller part to the

$:C$C@A$ in the

callee part

rom the caller )8 to

the $:C$C@A$ where

the caller )8 registered

rom the caller )8 tothe $:C$C@A$ where

the caller )8 registered

SS procedureMO procedure M procedure

Internal P"ases of t"e IMS Session Procedure

8sta+lishment o* sessions include 3rigination procedures, $$

procedures and Termination procedures

Siple Model for Call Proced re


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Siple Model for Call Procedure

$:C$C ":C$C

:C$C:C$C

$:C$C

Caller partCallee part

.re?uest

2.re?uest

!.re?uest (.re?uest

/.re?uest

1.re?uest

$ignalin

g#edia

media

H$$

MO S

S

M

-;$@8;)

#

-uring a call +etween "#$ users, the :C$C, ":C$C, and $:C$C completes the

entire signaling routing procedure.


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D%SJ/%(M

Media

":C$C

:C$C

$:C$C

H$$:

C$C

Calling part- Called part-

K?=G?

1?.1G.0.10: "wgu-A"uawei.co

/%(

MD%S

"uawei.co

S2CSC8

/%(M

D%S function/%(M

function

Basic Session /stablis"ent


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Invite

Basic Session /stablis"ent

Procedure Between IMS (sers

Invite

Invite

Invite

Invite

Invite

1?:

1?:

1?:

1?:

1?:

1?:

edia

$:C$C:A

H$$:A

:C$C:A

":C$C:A

":C$C:&

H$$:&

$:C$C:&

:C$C:&

D%S/%(M


Processing of Service riggering


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Processing of Service riggering

"nvite /

>!

>!

>!

>!

IP edia strea

S2CSC82'

9SS2'

P2CSC82'

I2CSC82'

I2CSC82B

9SS2B

S2CSC82B

P2CSC82B

"nvite

"nvite 2"nvite 9

"nvite 0

'S2' 'S2B

>!

"nvite ! "nvite 4"nvite ( "nvite >

"nvite 1

D%S/%(M



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IMS (ser Call to a PS% (ser

IMS calling

part-

"nvite

S2CSC82'

9SS2'

P2CSC82'

(M7

I2CSC82'M7C8

"nvite

#edia

control

PS%

PS% called part-

"A#"nvite

/%(M

uer-

el

8ail

"nvite

PS% ( C ll t IMS (


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PS% (ser Call to an IMS (ser

I2CSC82'

9SS2'

P2CSC82'

(M7

S2CSC82'M7C8 PS%PM%

PS%

calling part-

"A#

"nvite"nvite

"nvite

"nvite

IMS called part-

R ti D i t" S i


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Routing During t"e Session

/stablis"ent Procedure

#3 procedure 5#o+ile origination6 rom the calling )8 to the :C$C

The )8 o+tains the :C$C address through :C$C discovery and thus routes the call

to the :C$C.

rom the calling :C$C to the calling $:C$C

&oth the )8 and :C$C o+tain the $:C$C address through the registration procedure. $$ procedure

rom the calling $:C$C to the called ":C$C

The host part 5domain name6 o* the pu+lic user identity o* the callee is resolved through

-;$. The calling $:C$C receives an ":C$C address returned +y -;$.


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Routing During t"e Session /stablis"ent

Procedure )0*

#T procedure 5#o+ile termination6

rom the called ":C$C to the called $:C$C

$erving as the ingress o* the home networ o* the callee, the ":C$C ?ueries the local

H$$ to o+tain the $:C$C address selected +y the callee during the registration.

rom the called $:C$C to the called :C$C

The called $:C$C o+tains the address o* the called :C$C during the registration o* the

callee. ;ote that the $:C$C, serving as the registrar, converts the $" )" o* the called

)8 into the contact address.

rom the called :C$C to the called )8

The message is *orwarded to the called )8 according to the contact address o* the called

)8.

S i Si li P d f IMS (


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Session Signaling Procedure of IMS (sers

The "#$ user

per*orms

media

negotiation to

determine the

media "

address,media stream

type, and

coding@decodi

ng methods.

(/1PCSC81 SCSC81'S1 ICSC80

I%3I/

I%3I/

1?:1?:

PR'C5 PR'C5

0>> O5

)(PD'/*1?> Ringing

0>> O5

)I%3I/*'C5 'C5

0>> O5)PR'C5* 0>> O5)PR'C5*

(PD'/ (PD'/

PR'C5

0>> O5

0>> O5

)(PD'/*1?> Ringing

PR'C5

0>> O5

0>> O5

)I%3I/*

"e session is

establis"ed.

SCSC80'S0 PCSC80(/0

I%3I/ I%3I/

1?: 1?:

PR'C5

0>> O5)PR'C5*

(PD'/

0>> O5

)(PD'/*1?> Ringing 1?>

RingingPR'C5

0>> O5

0>> O5

)I%3I/*

0>> O5

)I%3I/*

'C5


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Media C"aracteristics %egotiation

The #edia ;egotiation is the procedures *or determining the set o*

negotiated characteristics 5media type, codec, etc6 +etween the

endpoints o* a multi:media session.

&oth sides need to negotiate the media type and the codec which they

are going to use.

Support4

Audio


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Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. age 1!

Media C"aracteristics %egotiation

#ediaCharacteristics

are descri+ed in

the $- in the

$" message

$upport codec

types

' SIP Message LI%3I/


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I%3I/ provided b- t"e first SDP4re+uired edia t-pe and all t"e codec*

Media C"aracteristics %egotiations

$" messages can contain $- to initiate media negotiation

1?: first response fro SDP4supported edia t-pe and t"e codec*

PR'C5 provided b- t"e second SDP4negotiated edia t-pe and t"e codec*

0>> O5) t"e second response fro SDP4confir to t"e edia t-pe and t"e codec

negotiated*


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uestions

hat are the phases o* the session esta+lishment procedureO hat are the main ;8s that are passed through in the +asic

session esta+lishment procedureO


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Suar-

"n this course, the *ollowing topics are covered

"#$ protocol

"#$ registration procedure

"#$ session procedure


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IMS Basic Signaling Procedure (SIP&IMS Procedures)

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Transcript of IMS Basic Signaling Procedure (SIP&IMS Procedures)