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Content for  TS 23.218  Word version:  16.0.0

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1  ScopeWord‑p. 7
The present document specifies the IP Multimedia (IM) Call Model for handling of an IP multimedia session origination and termination for an IP Multimedia subscriber.
The present document includes interactions between an Application Server and IP multimedia sessions.
The IP Multimedia (IM) Subsystem stage 2 is specified in TS 23.228.

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]  Void.
[2]
TR 21.905: "Vocabulary for 3GPP Specifications".
[3]
TS 23.228: " IP multimedia subsystem; Stage 2".
[4]  Void.
[5]
TS 24.229: "IP multimedia call control protocol based on SIP and SDP; stage 3".
[6]
RFC 3261:  "SIP: Session Initiation Protocol".
[7]
3GPP TR 29.998-4-4: Release 8 "Open Service Access (OSA); Application Programming Interface (API) Mapping for Open Service Access (OSA); Part 4: Call Control Service Mapping; Subpart 4: Multiparty Call Control SIP".
[8]
TS 29.228: "IP Multimedia (IM) Subsystem Cx Interface; Signalling flows and message contents".
[9]
TS 23.278: "Customised Applications for Mobile network Enhanced Logic (CAMEL); IP Multimedia System (IMS) interworking; Stage 2".
[10]
TS 23.008: "Organisation of subscriber data".
[11]
TS 33.203: "Access security for IP based services".
[12]
TS 29.198: "Open Service Access (OSA); Application programming Interface (API)".
[13]  Void.
[14]
TS 29.078: "Customised Applications for Mobile network Enhanced Logic (CAMEL) Phase 3; CAMEL Application Part (CAP) specification".
[15]
RFC 3264:  "An Offer/Answer Model with Session Description Protocol".
[16]
TS 29.002: "Mobile Application Part (MAP) specification".
[17]
TS 29.229: "Cx Interface based on the Diameter protocol".
[18]
TS 29.328: "IP Multimedia Subsystem (IMS) Sh Interface; Signalling flows and message contents".
[19]
TS 29.329: "Sh Interface based on the Diameter protocol".
[20]
TS 32.240: "Telecommunication management; Charging management; Charging architecture and principles".
[21]
TS 32.260: "Telecommunication management; Charging management; IP Multimedia Subsystem (IMS) charging".
[22]
RFC 5627  (October 2009): "Obtaining and Using Globally Routable User Agent URIs (GRUUs) in the Session Initiation Protocol (SIP)".
[23]
TS 24.147: "Conferencing using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3".
[24]
TS 24.247: "Messaging service using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3".
[25]
TS 33.328: "IMS Media Plane Security".
[26]
TS 29.364: "IP Multimedia Subsystem (IMS) Application Server (AS) service data descriptions for AS interoperability".
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3  Definitions and abbreviationsWord‑p. 8

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply:
Application Server Incoming Leg Control Model (AS-ILCM):
models AS behaviour for handling SIP information for an incoming leg.
Application Server information (AS-info):
AS-info contains individualized information concerning one particular Application Server entry.
This information contains e.g. Application Server Address (clause 6.9.2.1) and it's corresponding Default IP Multimedia Handling information (clause 6.9.2.2).
Application Server Outgoing Leg Control Model (AS-OLCM):
models AS behaviour for handling SIP information for an outgoing leg.
Combined ILSM OLSM - Incoming/outgoing Leg State Model:
models the behaviour of an S-CSCF for handling SIP messages on an incoming and outgoing session leg.
Filter Criteria (FC):
the information which the S-CSCF receives from the HSS or the AS that defines the relevant SPTs for a particular application.
They define the subset of SIP requests received by the S-CSCF that should be sent or proxied to a particular application.
Incoming Leg Control Model (ILCM):
models the behaviour of an S-CSCF for handling SIP information sent to and received from an AS for an incoming session leg.
Initial Filter Criteria (iFC):
filter criteria that are stored in the HSS as part of the user profile and are downloaded to the S-CSCF upon user registration.
They represent a provisioned subscription of a user to an application.
Initial Request:
a SIP request that either initiates the creation of a new dialog or is part of a standalone transaction.
IP Multimedia Service Switching Function (IM-SSF):
functional entity that interfaces SIP to CAP.
IP Multimedia CAMEL Subscription Information (IM-CSI):
identifies the subscriber as having IP Multimedia CAMEL services.
IP Multimedia session:
IP Multimedia session and IP Multimedia call are treated as equivalent in the present document.
Original Dialog Identifier:
an indication that the S-CSCF includes in a Route header for itself when sending requests to an AS. When the AS returns this indication in a Route header of a message sent to the S-CSCF, the S-CSCF uses it to associate the message with the previous request sent by the S-CSCF (i.e. the original SIP dialog).
Originating IP Multimedia CAMEL Subscription Information (O-IM-CSI):
identifies the subscriber as having originating IP Multimedia CAMEL services.
Outgoing Leg Control Model (OLCM):
models the behaviour of an S-CSCF for handling SIP information received from and sent to an AS for an outgoing session leg.
Private User Identity:
a unique global identity defined by the Home Network Operator, as defined in TS 23.228.
Public User Identity:
the public user identity/identities are used by any user for requesting communications to other users and are in the form of a SIP URL or TEL URL as defined in TS 23.228.
Served User:
The served user is the public user identity, for which the IM CN subsystem handles the call. For an origination call leg the served user is the user for which a UE or AS originates the call for. For a terminating call leg the served user is the user for which a UE or an AS terminates the call for.
Service Key:
the Service Key identifies to the Application Server the service logic that shall apply.
The Service Key is administered by the HPLMN. For CAMEL services, the Service Key is an element of the CAMEL Subscription Information (CSI).
Service Point Trigger (SPT):
the points in the SIP signalling that may cause the S-CSCF to send/proxy the SIP message to an SIP AS/OSA SCS/IM-SSF.
The subset of all possible SPTs which are relevant to a particular application are defined by means of Filter Criteria.
Service Platform Trigger Points (STP):
the points in the SIP signalling that instruct the SIP AS, OSA SCS and IM-SSF to trigger the service logic.
For the IM-SSF the IP Multimedia Camel Subscriber Information (IM-CSI) defines them.
Subsequent Filter Criteria (sFC):
filter criteria that are signalled from the SIP AS/OSA SCS/IM-SSF to the S-CSCF.
They allow for dynamic definition of the relevant SPTs at application execution time.
Subsequent Request:
a SIP request which is part of an existing dialog. This also includes target refresh requests as defined in RFC 3261.
Standalone Transaction:
a SIP transaction that is not part of an existing dialog and does not initiate the creation of a new dialog.
Terminating IP Multimedia CAMEL Subscription Information (T-IM-CSI):
identifies the subscriber as having terminating IP Multimedia CAMEL services.
 
For the purposes of the present document, the following terms and definitions given in TS 23.228, subclause 4.13 apply:
IMS application reference
IMS communication service
IMS communication service identifier
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3.2  AbbreviationsWord‑p. 9
For the purposes of the present document, the following abbreviations apply:
AAA
Authentication, Authorization, and Accounting
API
Application Programming Interface
AS
Application Server
AS-ILCM
Application Server Incoming Leg Control Model
AS-OLCM
Application Server Outgoing Leg Control Model
B2BUA
Back-to-Back User Agent
CAMEL
Customized Applications for Mobile network Enhanced Logic
CAP
CAMEL Application Part
CCF
Charging Collection Function
CDR
Charging Data Records
CF
Call Forwarding
CFonCLI
Call Forwarding on Calling Line Identification
CGI
Common Gateway Interface
CPL
Call Processing Language
CLI
Calling Line Identification
CSCF
Call Session Control Function
CSE
CAMEL Service Environment
ECF
Event Charging Function
FC
Filter Criteria
GPRS
General Packet Radio Service
GPRS CID
GPRS Charging IDentifiers
GRUU
Globally Routable User agent URI
gsmSCF
gsm Service Control Function
HPLMN
Home PLMN
HSS
Home Subscriber Server
IETF
Internet Engineering Task Force
I-CSCF
Interrogating CSCF
IARI
IMS Application Reference Identifier
ICID
IMS Charging ID
ICSI
IMS Communication Service Identifier
iFC
Initial Filter Criteria
ILCM
Incoming Leg Control Model
IM
IP Multimedia
IM-CSI
IP Multimedia CAMEL Subscription Information
IMS
IP Multimedia Subsystem
IMSI
International Mobile Subscriber Identity
IM-SSF
IP Multimedia Service Switching Function
IOI
Inter Operator Identifier
IP
Internet Protocol
ISC
IP multimedia Service Control
MAP
Mobile Application Part
MGCF
Media Gateway Control Function
MRFC
Multimedia Resource Function Controller
MRFP
Multimedia Resource Function Processor
O-IM-CSI
Originating IP Multimedia CAMEL Subscription Information
ODI
Original Dialog Identifier
OLCM
Outgoing Leg Control Model
OSA
Open Service Access
PLMN
Public Land Mobile Network
P-CSCF
Proxy CSCF
RFC
Request For Comments
SCF
Session Charging Function
SCIM
Service Capability Interaction Manager
SCS
Service Capability Server
SDP
Session Description Protocol
sFC
Subsequent Filter Criteria
SIP
Session Initiation Protocol
S-CSCF
Serving CSCF
SPT
Service Point Trigger
STP
Service platform Trigger Points
T-IM-CSI
Terminating IP Multimedia CAMEL Subscription Information
UA
User Agent
UE
User Equipment
URL
Uniform Resource Locator
XML
EXtensible Markup Language
MRB
Media Resource Broker
IVR
Interactive Voice Response
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4  Architecture and information flows for IM multimedia sessionWord‑p. 11

4.0  Introduction |R7|

Subclause 4.1 and Subclause 4.2 show the architecture for handling a basic UE-originating multimedia session and a basic UE-terminating multimedia session. A basic UE-to-UE multimedia session is treated as the concatenation of a UE-originating multimedia session and a UE-terminating multimedia session.

4.1  Architecture for a UE-originating IP multimedia session

This is specified in TS 23.228.

4.2  Architecture for a UE-terminating IP multimedia session

This is specified in TS 23.228.

4.3Void

4.4Void

4.5Void


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