IMS Architecture and Interfaces
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What is the primary function of an S-CSCF in IMS?

  • To act as a mobile's first contact point inside a local IMS
  • To generate Call Detail Records (CDRs) only
  • To provide session control services for a user (correct)
  • To act as a Policy Control Function (PCF)

    • What is one of the main tasks of an S-CSCF during registration?

  • To generate Call Detail Records (CDRs) for accounting and billing
  • To act as a SIP Proxy Server
  • To make users' registration and location information available to location servers (correct)
  • To control policy regarding how bearers in the packet-switched network should be used

    • What is the function of a P-CSCF in IMS?

  • To act as a SIP Proxy Server (correct)
  • To act as a Policy Control Function (PCF) only
  • To provide session control services for a user
  • To act as a Serving Call State Control Function

    • What is an S-CSCF responsible for during session control?

    <p>Relaying SIP requests and responses between calling and called parties</p> Signup and view all the answers

    What is an additional function of an S-CSCF?

    <p>To provide service-related event notifications to users</p> Signup and view all the answers

    What does a P-CSCF include?

    <p>A Policy Control Function (PCF)</p> Signup and view all the answers

    What does an S-CSCF act as during interactions with application servers?

    <p>An interface to application servers</p> Signup and view all the answers

    What is generated by an S-CSCF for accounting and billing?

    <p>Call Detail Records (CDRs)</p> Signup and view all the answers

    What is the main goal of IMS in the telecommunications industry?

    <p>To attract and retain subscribers by offering different services</p> Signup and view all the answers

    What kind of services can IMS provide?

    <p>Real-time and non-real-time multimedia sessions</p> Signup and view all the answers

    What is the main issue faced by fixed and mobile operators?

    <p>Subscriber churn</p> Signup and view all the answers

    What is the focus of IMS architecture?

    <p>To provide a standardized solution for telecommunications</p> Signup and view all the answers

    What is the advantage of IMS over proprietary solutions?

    <p>It is a standardized solution</p> Signup and view all the answers

    What is the goal of IMS in terms of service convergence?

    <p>To converge services supplied by different types of networks</p> Signup and view all the answers

    What kind of network does IMS support?

    <p>All-IP network</p> Signup and view all the answers

    What is the benefit of IMS for subscribers?

    <p>It provides personalized services</p> Signup and view all the answers

    What is the primary focus of IMS standardization in 3GPP Release 5?

    <p>Non-real time services</p> Signup and view all the answers

    What is the main benefit of IMS from an end-user perspective?

    <p>New, exciting services and enhancements of existing services</p> Signup and view all the answers

    What is the role of SIP in IMS?

    <p>Supporting signaling and session control for real-time services</p> Signup and view all the answers

    What is the main benefit of IMS from an operator perspective?

    <p>Quality of Service</p> Signup and view all the answers

    What is the main benefit of IMS from a general perspective?

    <p>Grow and protect subscriber base, increase ARPU</p> Signup and view all the answers

    What is the primary focus of IMS standardization in 3GPP Release 6?

    <p>Real-time services</p> Signup and view all the answers

    What is the main function of the Serving CSCF (S-CSCF)?

    <p>Dependent on the specific tasks performed</p> Signup and view all the answers

    What is the scope of IMS extended in 3GPP Release 7?

    <p>Any IP access network, including fixed access networks</p> Signup and view all the answers

    What type of information is stored in HSS?

    <p>User authentication data, service profile, and charging information</p> Signup and view all the answers

    What is the primary function of the SLF?

    <p>To locate the correct HSS in a large network</p> Signup and view all the answers

    What protocol is used for communication between HSS and SLF?

    <p>Diameter</p> Signup and view all the answers

    What is the function of the Media Gateway Control Function (MGCF)?

    <p>Signaling inter-working between PS domain and CS networks</p> Signup and view all the answers

    What information is used by the SLF to locate the correct HSS?

    <p>User-ID/ HSS-ID</p> Signup and view all the answers

    Is the SLF a mandatory component in IMS?

    <p>No</p> Signup and view all the answers

    What is the function of the IM Media Gateway (IM-MGW)?

    <p>Media inter-working between PS domain and CS networks</p> Signup and view all the answers

    What is the primary function of the HSS?

    <p>To support IMS network entities and handle calls</p> Signup and view all the answers

    What is the primary function of the MRFP?

    <p>To provide resources to be controlled by the MRFC</p> Signup and view all the answers

    What is processed by the MRFP?

    <p>Media streams, including audio transcoding and media analysis</p> Signup and view all the answers

    What is the role of the BGCF?

    <p>To select to which PSTN network a session should be forwarded</p> Signup and view all the answers

    What is supported by the MRFP within the bearer path?

    <p>DTMF</p> Signup and view all the answers

    What is the role of the MRFC?

    <p>To interpret signaling information from an S-CSCF or a SIP-based Application Server</p> Signup and view all the answers

    What is responsible for interfacing with internal and external service platforms?

    <p>S-CSCF</p> Signup and view all the answers

    What is forwarded by the I-CSCF?

    <p>SIP request to the S-CSCF</p> Signup and view all the answers

    What type of platforms does the S-CSCF interface with?

    <p>SIP application servers, OSA Service Capability Servers, and IP Multimedia Service Switching Function</p> Signup and view all the answers

    Study Notes

    IMS (IP Multimedia Subsystem)

    • IMS is a standardized solution in the telecommunications world that provides real-time multimedia sessions and non-real-time multimedia sessions over an all-IP network.
    • IMS targets convergence of services supplied by different types of networks (fixed, mobile, Internet).

    IMS Benefits

    • Quality of Service enhancements
    • New, exciting services and faster time to market with existing services
    • Service integration and same services available regardless of terminal and access type
    • Keeps charging relations with users and ease of use and security
    • Controlling CAPEX and OPEX

    IMS Standardization

    • IMS was initially standardized by 3GPP (3rd Generation Partnership Projects) as part of its Release 5 specifications.
    • 3GPP Release 6 targeted at supporting real-time services.
    • 3GPP Release 7 standardization extended IMS scope to any IP access network, including fixed access networks (e.g., DSL).

    IMS Architecture

    • IMS provides all the network entities and procedures to support real-time voice and multimedia IP applications.
    • IMS uses SIP to support signaling and session control for real-time services.

    CSCF (Call State Control Function)

    • Three types of CSCFs: Serving CSCF (S-CSCF), Proxy CSCF (P-CSCF), and Interrogating CSCF (I-CSCF).
    • S-CSCF: provides session control services for a user, maintains session states, and performs registration, session control, proxy server, and interactions with application servers.
    • P-CSCF: a mobile's first contact point inside a local IMS, acts as a SIP Proxy Server, and includes a Policy Control Function (PCF) to control policy regarding how bearers in the packet-switched network should be used.

    Databases: HSS and SLF

    • HSS (Home Subs Server): stores user data, authentication data, service profile, and charging information, and performs authentication and authorization of users.
    • SLF (Subs Location Function): an optional component that helps locate the correct HSS in a large network, uses Diameter protocol to communicate with HSS.

    IMS Entities

    • MGCF (Media Gateway Control Function): responsible for signaling and media inter-working between PS domain and circuit-switched networks (e.g., PSTN).
    • IM-MGW (IM Media Gateway): responsible for media inter-working between PS domain and circuit-switched networks.
    • MRFP (Multimedia Resource Function Processor): provides resources to be controlled by the MRFC, sources media streams, processes media streams, and supports DTMF.
    • MRFC (Multimedia Resource Function Controller): interprets signaling information from an S-CSCF or a SIP-based Application Server and controls the media streams resources in the MRFP.
    • BGCF (Breakout Gateway Control Function): selects to which PSTN network a session should be forwarded.

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    Related Documents

    W4_JTO_Ph2_Datacom_IT-part-13.pdf

    Description

    Learn about the architecture of IMS, its core elements, interfaces, and application servers. Understand the basic call flow in IMS and its role in delivering various internet services.

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