Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz IMS IP Multimedia Subsystem

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz IMS is…  IP Multimedia Subsystem (IMS) is an architecture for offering multimedia services on the packet domain.  IMS is access agnostic, hence it is not just for UMTS or GPRS, but also supports WLAN, fixed line, LTE etc.  IMS is not a service, but a service enabler  IMS gives Service control by introducing service signalling  All IMS services can be done without IMS but without IMS, service creation can be complex, and expensive to the operator and the user  IMS gives Convergence of all media communications on to the packet network.

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Service interoperability non-IMS Operator 1 Operator 2 Operator 3 Service 1 Service 2 Service 1 Service 2 Service 1 Service 2

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Service interoperability IMS Operator 1 Operator 2 Operator 3 Service 1 Service 2 Service 1 Service 2 Service 1 Service 2

Slide title In CAPITALS 50 pt Slide subtitle 32 pt TE MT BSS/ GERAN RUm MTUTRAN RUu SGSNGGSN MGW MSC serverGMSC server HSS EIR CSCF MRF MGCFSGW PSTN/ Legacy/ External SGW Other PLMN s SGSN Applications & Services Multimedia IP Networks Applications & Services Other Access Networks Signalling Signalling and/or data IuIu Iu Mc Nb Nc MAP Mh MAP Mc Gi Gp Gn Gf Gr Cx CAP Gc Mr Gi Mc Gi Mw Mm Nb Mg Circuit Switched Domain IP Multimedia Domain Packet Switched Domain 3GPP Release 5 IMS architecture

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz IMS architecture RNC P-CSCF I-CSCF MRF MGW MGCF IMS S-CSCF MSC(Server) SGSN GGSN CN MGW BSC UMTS/GPRS WLAN Corporate SIP Application Servers SIP Application Servers HSS CDMA 2000

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Architecture Elements IM-SSF I-CSCFMRF MGW MGCF HSS CSE(SCP)SIP Application Servers OSA-SCSSGW OSA Application Server S-CSCF P-CSCFBGFC Database Elements HSS (Home Subscriber Server) SLF (Subscription Locator Function) IMS Control Elements (Call Session Control Function) S-CSCF P-CSCF I-CSCF Control Plane Interworking Elements MGCF - Media Gateway Control Function BGCF - Breakout Gateway Control Function SGW - Signaling Gateway

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Other Elements IMS Service Elements AS (Application Server) External Service and Service Interworking Elements OSA SCS OSA Framework OSA Application Server CAMEL elements - IM-SSF (IP Multimedia Switching Service Function) Resource Elements Media Resources Function (MRF) Media Interworking Elements MGW (Media Gateway) IM-SSF I-CSCFMRF MGW MGCF HSS CSE(SCP)SIP Application Servers OSA-SCSSGW OSA Application Server S-CSCF P-CSCFBGCF

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Proxy-CSCF (P-CSCF) Visited IMS Network S-CSCF I-CSCFMRF MGW MGCF HSS SIP Application Servers OSA-SCS SGW Internet IP networks PSTN PLMN Home IMS Network Visited Access Network GGSN P-CSCF CSE(SCP) IM-SSF OSA Application Server S-CSCF Home Access Network GGSN P-CSCF Entry point to IMS from any access network Local outbound stateful proxy for all SIP requests/responses, ensuring all signalling is sent via the home network Performs compression/decompression for efficient use of the radio interface Performs integrity protection mechanisms using IPsec Includes a Policy Decision Function (PDF) that authorizes bearer resources The P-CSCF and the GGSN are located in the same network, that is, either both in the visited PLMN or both in the home PLMN.

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz PDF S-CSCF I-CSCFMRF MGW MGCF HSS SIP Application Servers OSA-SCS SGW Home IMS Network CSE(SCP) IM-SSF OSA Application Server S-CSCF Home Access Network GGSN P-CSCF PDF Performs policy control and media authorisation based on the policy of the access network and based on the session parameters carried in the SIP signalling

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Interrogating-CSCF (I-CSCF) Visited IMS Network S-CSCF I-CSCF MRF MGW MGCF HSS SIP Application Servers OSA-SCS SGW Internet IP networks PSTN PLMN Home IMS Network Visited Access Network GGSN P-CSCF CSE(SCP) IM-SSF OSA Application Server S-CSCF Home Access Network GGSN P-CSCF First point of contact in the home network from a visited NW Acts as a SIP proxy located at the edge of a network. Queries the HSS to help in selecting a S- CSCF for a user.

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Serving-CSCF (S-CSCF) Visited IMS Network S-CSCF I-CSCF MRF MGW MGCF HSS SIP Application Servers OSA-SCS SGW Internet IP networks PSTN PLMN Home IMS Network Visited Access Network GGSN P-CSCF CSE(SCP) IM-SSF OSA Application Server Home Access Network GGSN P-CSCF Stateful SIP server providing session control. Acts as a SIP registrar Always located in the home network. Central point for control of operator provided services. Performs authentication.

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz HSS and SLF Home Subscriber Server (HSS) An evolution of the HLR HLR (subscriber and authentication data for CS and PS domains) + the new IMS functionality Location Register IMS subscriber records IMS service profile processing IMS authentication data Visited IMS Network S-CSCF I-CSCF MRF MGW MGCF HSS SIP Application Servers OSA-SCS SGW Internet IP networks PSTN PLMN Home IMS Network Visited Access Network GGSN P-CSCF CSE(SCP) IM-SSF OSA Application Server Home Access Network GGSN P-CSCF Subscription Locator Function (SLF) A look-up function that can be used in networks where several HSS exist.

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Breakout Gateway Control Function (BGCF) BGCF External Network S-CSCF Home GSM/UMTS CS Network GGSN MGW MGCF BGCF MGW MGCF Home NetworkExternal Network Selects the appropriate PSTN/CS domain break out point for the session. Selects the network in which the interworking with the PSTN/CS Domain is to occur. If the interworking is in another network, then the BGCF will forward the SIP signalling to the BGCF of that network. If the interworking is in another network and network hiding is required by the operator, the BGCF will forward the SIP signalling via an I-CSCF toward the BGCF of the other network. Selects the MGCF in the network in which the interworking with PSTN/CS domain is to occur and forwards the SIP signalling to that MGCF.

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Multimedia Resource Function (MRF) MRF MRFC MRFP Mp Home Access Network GGSN S-CSCF I-CSCF MRF MGW MGCF HSS SIP Application Servers OSA-SCS SGW Home IMS Network CSE(SCP) IM-SSF OSA Application Server P-CSCF The media resource function provides the additional media resources complementary or fundamental for services. The functions to be applied will be: Conference management such as, a floor control mechanism to allow some members of a conference to control the conference. To provide additional media streams to the session, such as media fade-in for rich calls. Play announcements and tones The MRF is split in to two functional parts : Multimedia Resource Function Controller (MRFC) Multimedia Resource Function Processor (MRFP)

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz IMS service environment Visited IMS Network I-CSCFMRF MGW MGCF HSS SIP Application Servers OSA-SCS SGW Internet IP networks PSTN PLMN Home IMS Network Visited Access Network GGSN P-CSCF CSE(SCP) IM-SSF OSA Application Server S-CSCF Home Access Network GGSN P-CSCF There are three different types of application servers, depending on the application hosted: SIP AS (Application Server): IMS native applications IM-SSF (IP Multimedia Switching Service Function) Legacy applications OSA-SCS (Service Capability Server): Service frameworks (e.g. OSA)

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz SIP Application Server I-CSCFMRF MGW MGCF HSS SIP Application Servers OSA-SCS SGW Home IMS Network CSE(SCP) IM-SSF OSA Application Server S-CSCF Home Access Network GGSN P-CSCF Accept requests and responses. It will be able to control, finish or initiate a new SIP transaction Route the session towards another user or network Interact with other service platforms for the support of services Communicate with the HSS in order to obtain information about subscriptions and services

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Registration to the network UEIMSGSN 1. Bearer Level Registration: GPRS2. PDP Context Activation3. CSCF Discovery4. Application Level Registration HLR

Slide title In CAPITALS 50 pt Slide subtitle 32 pt P-CSCF I-CSCF Home A P-CSCF Visited A Home B I-CSCF HSS S-CSCF Steps: 1) Route signalling to A’s home network Visited B Steps: 1) Route signalling to A’s home network 2) Route signalling to B’s home network Steps: 1) Route signalling to A’s home network 2) Route signalling to B’s home network 3) Route signalling to B terminal S-CSCF SGSN Radio Access Network GGSN SGSN Radio Access Network AS User plane (RTP) 18 Session establishment model

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz The I-CSCF finds the S-CSCF allocated to this user or selects a new S-CSCF for this user. I-CSCF The I-CSCF contacts the HSS to find the S- CSCF serving this subscriber. I-CSCF The S-CSCF challenges the subscriber S-CSCF The P-CSCF finds the I-CSCF with the help of DNS P-CSCF The S-CSCF downloads the authentication vector for this subscriber from the HSS S-CSCF A UE initiates a SIP Registration including his public user ID and his private user ID Subscriber S-CSCF Home A 2. REGISTER9. Unauthorized P-CSCF Visited A 10. Unauthorized 1. REGISTER I-CSCF 5. REGISTER 8. Unauthorized A GGSN SGSN Radio Access Network SIP-AS Application level Registration (I) HSS

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz The I-CSCF contacts the HSS to find the S- CSCF serving this subscriber. I-CSCF The S-CSCF authorizes the registration and informs the subscriber S-CSCF The S-CSCF informs the HSS that this S- CSCF is serving the subscriber. The HSS sends the S-CSCF the service profile S-CSCF The S-CSCF informs the other Application Servers about the user's registration S-CSCF The I-CSCF finds the S-CSCF allocated to this user I-CSCF The P-CSCF finds the I-CSCF with the help of DNS P-CSCF The UE calculates the credentials and re- initiates the SIP Registration Subscriber S-CSCF Home A 12. REGISTER21. OK P-CSCF Visited A 22. OK 11. REGISTER I-CSCF 15. REGISTER 20. OK A GGSN SGSN Radio Access Network SIP-AS Application level Registration (II) HSS REGISTER 19. OK

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz The I-CSCF fetches from the HSS the address of the S-CSCF that is serving subscriber B I-CSCF The I-CSCF routes the message to the originating S-CSCF I-CSCF The P-CSCF is the first point of contact in the IMS for the subscriber. It forwards the INVITE request to the I-CSCF P-CSCF The S-CSCF in Home B performs service invocation for subscriber B. It forwards the INVITE to the P-CSCF and UE S-CSCF The S-CSCF in Home A performs service invocation for subscriber A. The S- CSCF finds the entry point in Home B S-CSCF The HSS returns the address of the S-CSCF serving subscriber B HSS Subscriber A initiates a SIP invitation including the SIP URI of subscriber B. Subscriber P-CSCF Visited B S-CSCF Home A 1. INVITE 2. INVITE8. INVITE 11. OK 13. OK 15. OK P-CSCF Visited A 16. OK S-CSCF Home B I-CSCF 7. INVITE 12. OK 4. INVITE I-CSCF 3. INVITE 14. OK A Calls B 5 6 B HSS A 9. INVITE 10. OK GGSN SGSN Radio Access Network GGSN SGSN Radio Access Network SIP-AS Session Establishment SIP-AS

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz The MG performs the bearer interworking between RTP/IP and the bearer used in the PSTN network MG Subscriber A initiates a SIP invitation including the E.164 number of subscriber B. Subscriber The S-CSCF detects: No SIP URL assigned to the E.164 number. The call is routed to a home BGCF. S-CSCF. The S-CSCF queries the DNS for the tel URL. DNS returns a negative match. S-CSCF/DNS 11. IAM The BGCF selects the MGCF in the breakout network BGCF S-CSCF Home A 1. INVITE 2. INVITE9. ADD 10. RESP 14. OK 17. OK P-CSCF Visited A 18. OK MGCFBGCF 8. INVITE 13. OK 6. INVITE I-CSCF 3. INVITE 16. OK A Calls B (CS Subscriber) A GGSN SGSN Radio Access Network MG 12. ANM IMS Gateway IMS-CS interworking DNS 4 5 BGCF 7. INVITE 15. OK The home BGCF selects another BGCF, perhaps in another network BGCF The MGCF performs the signalling interworking between SIP and the BICC/ISUP in PSTN MGCF

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Interfaces of IMS Visited IMS Network I-CSCFMRF MGW HSS SIP Application Servers OSA-SCS T-SGW Internet IP networks PSTN PLMN Home IMS Network Visited Access Network GGSN P-CSCF CSE(SCP) IM-SSF OSA Application Server S-CSCF Home Access Network GGSN P-CSCF MGCF SIP Diameter IP TDM SS7 ISC Cx Sh Mw Mr Mg Gi ISUP/BICC BGCF Mi

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz End-to-End QoS and Policy Enforcement Architecture Bearer Plane Bearer Plane Control Plane Control Plane Terminal SIP UA P-CSCF S-CSCF GGSNBearer PDF The Go interface provides the link between the control plane and the bearer plane in the network. The terminal also provides the link between the two planes.

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Policy Control UMTS Control Plane UMTS Control Plane IMS Control Plane IMS Control Plane Terminal SIP UA P-CSCF S-CSCF GGSN Session Manager PDF (0) P-CSCF receives ‘final ‘SDP (1) Generate QoS parameters (2) Generate Authorisation token (3) Forward token to terminal (4) Generate QoS parameters (5) Request PDP activation with token (6) Determine PDF. (7) Req authorisation from PDF. (8) Authorise resources. (9) Authorise PDP activation (10) Commence policing of traffic NOTE: When the service is renegotiated, the approval process as described above is repeated in its entirety with new resource allocations.

Top right corner for field-mark, customer or partner logotypes. See Best practice for example. Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level pt Rev ALimited InternalETH/RKC Sarolta Dibuz Wireline and Wireless evoluation  Wireless –VoIP is limited now –Push –to-talk comes first  Wireline –More close –No bandwidth constraints –No roaming issues –Advanced terminals –VoIP advanced –Operators are ready to take the next step