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Questions and Answers

What is the primary goal of IMS in the telecommunications world?

  • To provide differentiation in services and strengthen customer relationships (correct)
  • To replace traditional telephony services
  • To offer cheap or free calls over the Internet
  • To adopt proprietary solutions

    • What type of sessions can IMS provide?

  • Only non-real-time multimedia sessions
  • Only video sessions
  • Both real-time and non-real-time multimedia sessions (correct)
  • Only voice sessions

    • What is the main advantage of IMS in the telecommunications world?

  • It is a standardized solution (correct)
  • It is only available for mobile networks
  • It provides low-quality services
  • It offers proprietary solutions

    • What is the primary focus of IMS?

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

    What is the role of IMS in the telecommunications world?

    <p>To provide standardized multimedia services</p> Signup and view all the answers

    What is the main benefit of IMS for operators?

    <p>Reducing subscriber churn</p> Signup and view all the answers

    What is the main goal of IMS for subscribers?

    <p>To offer personalized services</p> Signup and view all the answers

    What is the key way to retain subscribers according to IMS?

    <p>Building on and strengthening customer relationships</p> Signup and view all the answers

    What is the main goal of IMS in Next Generation Networks (NGNs)?

    <p>To make convergence between any IP networks and vertical handoff</p> Signup and view all the answers

    Which of the following is NOT a component of IMS architecture?

    <p>DNS Server</p> Signup and view all the answers

    What is the role of HSS in IMS architecture?

    <p>To provide user authentication and authorization</p> Signup and view all the answers

    Which IMS component is responsible for routing mobile-to-mobile calls?

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

    What is the purpose of IMS-based interworking architecture?

    <p>To enable communication between two different IP networks</p> Signup and view all the answers

    What is the role of P-CSCF in IMS architecture?

    <p>To act as a proxy for user equipment</p> Signup and view all the answers

    Which IMS component is responsible for user registration and re-registration?

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

    What is the primary function of S-CSCF in IMS architecture?

    <p>To manage session setup and control</p> Signup and view all the answers

    What is the primary function of the IMS?

    <p>To provide all network entities and procedures for real-time voice and multimedia IP applications</p> Signup and view all the answers

    What is the role of the Serving CSCF (S-CSCF)?

    <p>To interact with the Home Subscriber Server (HSS) for user authentication</p> Signup and view all the answers

    What is the main difference between 3GPP Release 5 and 3GPP Release 6?

    <p>Release 5 supports non-real-time services, while Release 6 supports real-time services</p> Signup and view all the answers

    What is the role of the Proxy CSCF (P-CSCF)?

    <p>To act as a proxy for user requests</p> Signup and view all the answers

    What is the primary function of the Interrogating CSCF (I-CSCF)?

    <p>To find the next hop for routing user requests</p> Signup and view all the answers

    What is the role of SIP in the IMS architecture?

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

    What is the main goal of IMS standardization?

    <p>To support any IP access network, including fixed and wireless networks</p> Signup and view all the answers

    What is the role of the Home Subscriber Server (HSS) in the IMS architecture?

    <p>To store user profile information</p> Signup and view all the answers

    What is IMS also known as?

    <p>Multimedia NGN (Next Generation Network)</p> Signup and view all the answers

    Who can deploy IMS?

    <p>Any entity, including those without an access or transport network</p> Signup and view all the answers

    What does IMS offer to make interoperability of new MM services easier?

    <p>Standardized service enablers and network interfaces</p> Signup and view all the answers

    What is the primary goal of IMS for operators?

    <p>To protect the operator business model and generate new revenue</p> Signup and view all the answers

    How does IMS solve service scalability?

    <p>By offering support to compose services and expand existing services</p> Signup and view all the answers

    What is the core of IMS?

    <p>Combining the best of datacom and telecom industries</p> Signup and view all the answers

    Why is IMS important?

    <p>Because it enables the creation and delivery of PS-based person-to-person MM services</p> Signup and view all the answers

    What type of decision is IMS deployment considered?

    <p>A strategic business decision</p> Signup and view all the answers

    What is the role of the S-CSCF in the IMS architecture?

    <p>Interfaces with internal and external service platforms</p> Signup and view all the answers

    What is the function of the I-CSCF in the IMS architecture?

    <p>Selects an S-CSCF in the home network for this user session</p> Signup and view all the answers

    What is the role of the P-CSCF in the IMS architecture?

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

    What is the function of the MRFC in the IMS architecture?

    <p>Interprets signaling information from an S-CSCF</p> Signup and view all the answers

    What is the function of the MRFP in the IMS architecture?

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

    What is the role of the BGCF in the IMS architecture?

    <p>Forwards the session signaling to the appropriate MGCF and BGCF</p> Signup and view all the answers

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

    <p>SIP application servers, Open Service Access (OSA) Service Capability Servers, and IP Multimedia Service Switching Functions</p> Signup and view all the answers

    Where does the initial SIP request from a mobile travel to first?

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

    What type of services can a SIP server provide in addition to session control?

    <p>Value-added services</p> Signup and view all the answers

    What enables operators to leverage existing infrastructure for IMS services?

    <p>CAMEL Service Environment (CSE)</p> Signup and view all the answers

    What interfaces with the CSE by CAP?

    <p>IM-SSF</p> Signup and view all the answers

    What is the primary function of the OSA application server framework?

    <p>To enable third-party applications to secure access to the IMS</p> Signup and view all the answers

    What does the OSA application server interface with through the OSA API?

    <p>OSA SCS</p> Signup and view all the answers

    What type of services can be developed using the OSA application server framework?

    <p>Third-party applications that are not owner of the network infrastructure</p> Signup and view all the answers

    What do the OSA SCS and IM-SSF interface with respectively?

    <p>CSCF and CSE</p> Signup and view all the answers

    What is the primary function of the IM-SSF?

    <p>To host CAMEL features</p> Signup and view all the answers

    What is the primary consideration for IMS deployment?

    <p>Strategic decision</p> Signup and view all the answers

    What is the benefit of IMS for operators in terms of revenue?

    <p>Protects the operator business model and generates new revenue</p> Signup and view all the answers

    What is the core of IMS combining?

    <p>The best of two worlds: datacom industry and telecom industry</p> Signup and view all the answers

    What does IMS offer to make interoperability of new MM services easier?

    <p>Standardized service enablers and network interfaces</p> Signup and view all the answers

    What is the impact of IMS architecture on service scalability?

    <p>It solves service scalability</p> Signup and view all the answers

    Who can deploy IMS?

    <p>Any entity that decides to start an activity in IP services</p> Signup and view all the answers

    What is the primary goal of IMS for operators?

    <p>To protect the operator business model and generate new revenue</p> Signup and view all the answers

    What is IMS also known as?

    <p>Next Generation Network (NGN)</p> Signup and view all the answers

    What is the primary function of the P-CSCF in the IMS architecture?

    <p>To forward SIP REGISTER requests from a mobile to the mobile's home network</p> Signup and view all the answers

    What is the main function of the I-CSCF in the IMS architecture?

    <p>To select an S-CSCF for a user's session</p> Signup and view all the answers

    What is the purpose of the P-CSCF compressing and decompressing SIP messages?

    <p>To minimize the air-interface time</p> Signup and view all the answers

    What is the role of the P-CSCF in forwarding SIP messages from a mobile to a SIP server?

    <p>It determines to which SIP server the messages should be forwarded based on the result of the SIP registration process</p> Signup and view all the answers

    What is the role of the I-CSCF in hiding an operator's network internal structure?

    <p>It is used to hide an operator's network internal structure from an external network</p> Signup and view all the answers

    What is the role of the P-CSCF in detecting emergency sessions?

    <p>It is responsible for detecting emergency sessions</p> Signup and view all the answers

    What is the role of the P-CSCF in maintaining a security association with the mobile?

    <p>It maintains a security association with the mobile</p> Signup and view all the answers

    What is the role of the P-CSCF in creating CDRs?

    <p>It is responsible for creating CDRs</p> Signup and view all the answers

    What is the primary function of the S-CSCF in the IMS architecture?

    <p>To act as a SIP Registrar and accept users' SIP registration requests</p> Signup and view all the answers

    What is the main task of the S-CSCF in session control?

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

    What is the role of the P-CSCF in the IMS architecture?

    <p>To act as a SIP Proxy Server and relay SIP messages between users and other CSCFs</p> Signup and view all the answers

    What is the function of the Policy Control Function (PCF) in the P-CSCF?

    <p>To control the policy regarding how bearers in the packet-switched network should be used</p> Signup and view all the answers

    What is the relationship between the S-CSCF and the HSS?

    <p>The S-CSCF makes users' registration and location information available to the HSS</p> Signup and view all the answers

    What is the purpose of the S-CSCF in relation to application servers?

    <p>To interact with application servers and other IP or legacy service platforms</p> Signup and view all the answers

    What is the primary function of the S-CSCF in relation to user sessions?

    <p>To maintain session states for a registered user's on-going sessions</p> Signup and view all the answers

    What is the role of the P-CSCF in relation to mobile devices?

    <p>To act as a SIP Proxy Server and relay SIP messages between mobiles and other servers</p> Signup and view all the answers

    What is the main goal of IMS in Next Generation Networks (NGNs)?

    <p>To make convergence between any IP networks and a vertical handoff</p> Signup and view all the answers

    What is the primary function of IMS-based interworking architecture?

    <p>To enable communication between different IP networks</p> Signup and view all the answers

    What is the role of IMS in the telecommunications world?

    <p>To enable communication between different IP networks</p> Signup and view all the answers

    What is the primary focus of IMS?

    <p>To enable communication between different IP networks</p> Signup and view all the answers

    What is the main advantage of IMS for subscribers?

    <p>Seamless handovers between different IP networks</p> Signup and view all the answers

    What is the role of the S-CSCF in the IMS architecture?

    <p>To handle user registration and re-registration</p> Signup and view all the answers

    What is the role of the P-CSCF in the IMS architecture?

    <p>To act as an entry point for mobile users</p> Signup and view all the answers

    What is the primary function of the IMS-based interworking architecture?

    <p>To enable communication between different IP networks</p> Signup and view all the answers

    What is the main role of the IMS in Next Generation Networks (NGNs)?

    <p>To provide converged services between different IP networks</p> Signup and view all the answers

    What is the focus of the IMS-based interworking architecture for NGN networking?

    <p>To provide converged services between different IP networks</p> Signup and view all the answers

    What is the primary advantage of IMS for operators?

    <p>Increased revenue generation</p> Signup and view all the answers

    What is the role of IMS in achieving service convergence?

    <p>To enable service convergence between different IP networks</p> Signup and view all the answers

    What is the primary goal of IMS standardization?

    <p>To enable interoperability between different IP networks</p> Signup and view all the answers

    What is the benefit of IMS for subscribers?

    <p>Access to converged services across different IP networks</p> Signup and view all the answers

    What is the key to IMS-based revenue generation for operators?

    <p>Leveraging existing infrastructure for IMS services</p> Signup and view all the answers

    What is the primary consideration for IMS deployment?

    <p>Business model and revenue generation</p> Signup and view all the answers

    What is the main advantage of IMS in terms of service delivery?

    <p>Enhanced interoperability of new MM services</p> Signup and view all the answers

    What enables operators to create and deliver person-to-person MM services more effectively?

    <p>IMS deployment</p> Signup and view all the answers

    What is a key benefit of IMS architecture?

    <p>Enhanced scalability</p> Signup and view all the answers

    What is the core of IMS?

    <p>Combining the best of two worlds: datacom industry &amp; telecom industry</p> Signup and view all the answers

    Who can deploy IMS?

    <p>Either traditional service providers or new entities</p> Signup and view all the answers

    What type of decision is IMS deployment considered?

    <p>Strategic business decision</p> Signup and view all the answers

    What is a key benefit of IMS for operators?

    <p>Generation of new revenue</p> Signup and view all the answers

    What does IMS offer to make interoperability of new MM services easier?

    <p>Standardized service enablers and network interfaces</p> Signup and view all the answers

    What is the main benefit of IMS for end-users?

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

    What is the role of the IMS in supporting IP multimedia sessions?

    <p>To provide real-time voice and multimedia IP applications</p> Signup and view all the answers

    What is the primary goal of IMS standardization?

    <p>To support both real-time and non-real-time services</p> Signup and view all the answers

    What is the main advantage of IMS for operators in terms of revenue?

    <p>Increased ARPU through new services</p> Signup and view all the answers

    What is the role of SIP in the IMS architecture?

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

    What is the main benefit of IMS for service convergence?

    <p>Single platform for multiple access networks</p> Signup and view all the answers

    What is the primary goal of IMS in terms of network architecture?

    <p>To provide a single platform for multiple access networks</p> Signup and view all the answers

    What is the main advantage of IMS in terms of interoperability and standardization?

    <p>Interoperability with multiple access networks</p> Signup and view all the answers

    What type of interface does the S-CSCF use to interface with all service platforms?

    <p>ISC interface</p> Signup and view all the answers

    What is the primary function of the OSA application server framework?

    <p>To provide open access to 3rd party service providers</p> Signup and view all the answers

    What protocol is used over the ISC interface for signaling?

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

    What type of services can be developed using the OSA application server framework?

    <p>Value-added services (VAS) and operator-specific services</p> Signup and view all the answers

    What is the role of the S-CSCF in the IMS architecture?

    <p>To control session establishment and release</p> Signup and view all the answers

    What does the OSA SCS interface with?

    <p>Application servers</p> Signup and view all the answers

    What is the primary benefit of IMS for operators in terms of revenue?

    <p>Increased revenue from value-added services</p> Signup and view all the answers

    What is the primary consideration for IMS deployment?

    <p>Interoperability with legacy networks</p> Signup and view all the answers

    What is the primary function of the Multimedia Resource Function Processor (MRFP)?

    <p>To provide resources to be controlled by the MRFC, including media streams processing and tones and announcements</p> Signup and view all the answers

    What is the role of the Breakout Gateway Control Function (BGCF)?

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

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

    <p>All of the above, including SIP-based application servers, Open Service Access (OSA) Service Capability Servers, and IP Multimedia Service Switching Functions (IM-SSF)</p> Signup and view all the answers

    What is the primary function of the Multimedia Resource Function Controller (MRFC)?

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

    Where does the initial SIP request from a mobile travel to first?

    <p>The visited P-CSCF</p> Signup and view all the answers

    What is the primary function of the I-CSCF in the IMS architecture?

    <p>To select an S-CSCF in the home network for the user session</p> Signup and view all the answers

    What is the primary function of the S-CSCF in the IMS architecture?

    <p>To interface with internal and external service platforms</p> Signup and view all the answers

    What is the primary function of the MRFP in relation to media streams?

    <p>To provide resources to be controlled by the MRFC, including media streams processing and tones and announcements</p> Signup and view all the answers

    What type of services can the S-CSCF interface with, according to the ISC interface?

    <p>Operator-specific services</p> Signup and view all the answers

    What protocol is used for signaling over the ISC interface?

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

    What is the primary function of the OSA application server framework?

    <p>Providing open access to 3rd party service providers</p> Signup and view all the answers

    What does the OSA SCS interface with?

    <p>Application Servers</p> Signup and view all the answers

    What is the primary consideration for IMS deployment?

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

    What enables operators to leverage existing infrastructure for IMS services?

    <p>IMS standardization</p> Signup and view all the answers

    What type of services can be developed using the OSA application server framework?

    <p>Value-added services</p> Signup and view all the answers

    What is the primary function of the IM-SSF?

    <p>Interface with Legacy Service Platform</p> Signup and view all the answers

    What is the primary advantage of IMS for end-users?

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

    What is the primary goal of IMS standardization?

    <p>To provide a standard for any IP access network</p> Signup and view all the answers

    Which of the following is a type of CSCF in IMS architecture?

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

    What is the primary role of IMS in terms of revenue generation?

    <p>To increase ARPU</p> Signup and view all the answers

    What is the primary function of SIP in IMS architecture?

    <p>To support session control and signaling</p> Signup and view all the answers

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

    <p>To provide the same services regardless of terminal and access type</p> Signup and view all the answers

    What is the primary benefit of IMS in terms of interoperability?

    <p>To make interoperability of new multimedia services easier</p> Signup and view all the answers

    Which release of 3GPP is targeted at supporting real-time services?

    <p>Release 6</p> Signup and view all the answers

    What is the main driver for operators to rapidly push IMS?

    <p>Subscriber churn due to competition from new service providers</p> Signup and view all the answers

    What is the primary advantage of IMS in terms of service convergence?

    <p>Enabling convergence of services supplied indifferently by different types of networks</p> Signup and view all the answers

    What is unique about IMS in the telecommunications world?

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

    What is the primary function of the MRFP in the IMS architecture?

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

    What is the role of the BGCF in the IMS architecture?

    <p>Forwards the session signaling to the appropriate MGCF and BGCF in the destination PSTN network</p> Signup and view all the answers

    What type of relationships can IMS help build?

    <p>Business-to-business relations</p> Signup and view all the answers

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

    <p>SIP-based Application Server, Open Service Access (OSA) Service Capability Server (SCS), and IP Multimedia Service Switching Function (IM-SSF)</p> Signup and view all the answers

    What is IMS designed to provide?

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

    Where does the initial SIP request from a mobile travel to first?

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

    What is a key benefit of IMS for operators?

    <p>Differentiation in areas like personalization and service bundling</p> Signup and view all the answers

    What is the primary function of the MRFC in the IMS architecture?

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

    What is a key aspect of IMS architecture?

    <p>New concepts, new technologies, new partners and ecosystem</p> Signup and view all the answers

    What is a key goal of IMS?

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

    What is the primary consideration for IMS deployment?

    <p>Interoperability and standardization</p> Signup and view all the answers

    What type of services can be developed using the OSA application server framework?

    <p>A wide range of services, including SIP-based and IP Multimedia Services</p> Signup and view all the answers

    What enables operators to leverage existing infrastructure for IMS services?

    <p>IMS standardization and interoperability</p> Signup and view all the answers

    What is the primary function of the OSA application server framework?

    <p>To enable third-party applications to access IMS</p> Signup and view all the answers

    What type of services can a SIP server provide in addition to session control?

    <p>Various value-added services</p> Signup and view all the answers

    What enables operators to leverage existing infrastructure for IMS services?

    <p>CAMEL Service Environment (CSE)</p> Signup and view all the answers

    What interfaces with the CSE by CAP?

    <p>IM-SSF</p> Signup and view all the answers

    What do the OSA SCS and IM-SSF interface with respectively?

    <p>OSA application server and CSE</p> Signup and view all the answers

    What is the primary function of the IM-SSF?

    <p>To host the CAMEL features and interface with the CSE</p> Signup and view all the answers

    What type of services can be developed using the OSA application server framework?

    <p>Third-party applications</p> Signup and view all the answers

    What does the OSA application server interface with through the OSA API?

    <p>OSA SCS</p> Signup and view all the answers

    What is the main reason why IMS is seen as a key solution for operators to retain subscribers?

    <p>To build on and strengthen the customer relationship</p> Signup and view all the answers

    What is the primary focus of IMS in terms of network convergence?

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

    What is the main advantage of IMS being a standardized solution?

    <p>It enables rapid deployment and adoption by different operators</p> Signup and view all the answers

    What type of multimedia sessions does IMS provide in addition to real-time sessions?

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

    What is the primary benefit of IMS standardization for end-users?

    <p>Faster time to market with new services</p> Signup and view all the answers

    What is the main challenge faced by operators in today's competitive market?

    <p>Subscriber churn due to cheap calls over the Internet</p> Signup and view all the answers

    Which type of access network is NOT explicitly mentioned as part of the IMS scope in 3GPP Release 7?

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

    What is the main benefit of IMS for operators in terms of services?

    <p>It enables them to offer converged services</p> Signup and view all the answers

    What is the main role of IMS in the telecommunications world?

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

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

    <p>Session control and signaling</p> Signup and view all the answers

    What is the key difference between 3GPP Release 5 and 3GPP Release 6?

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

    What is the main focus of IMS in terms of subscriber relationships?

    <p>To retain existing subscribers</p> Signup and view all the answers

    What is the primary benefit of IMS for operators in terms of controlling CAPEX and OPEX?

    <p>Reduced CAPEX and OPEX</p> Signup and view all the answers

    What is the primary function of the Proxy CSCF (P-CSCF)?

    <p>Interworking with the access network</p> Signup and view all the answers

    What is the primary focus of IMS standardization in 3GPP Release 7?

    <p>Extension to any IP access network</p> Signup and view all the answers

    What enables IMS to provide a flexible and scalable architecture for operators?

    <p>Use of CSCFs for signaling and session control</p> Signup and view all the answers

    What is the primary function of the MRFP in the IMS architecture?

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

    What is the role of the BGCF in the IMS architecture?

    <p>Forwards the session signaling to the appropriate MGCF and BGCF in the destination PSTN network</p> Signup and view all the answers

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

    <p>SIP application server, Open Service Access (OSA) Service Capability Server (SCS), and IP Multimedia Service Switching Function (IM-SSF)</p> Signup and view all the answers

    Where does the initial SIP request from a mobile travel to first?

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

    What is the primary function of the MRFC in the IMS architecture?

    <p>Controls the media streams resources in the MRFP</p> Signup and view all the answers

    What is the role of the I-CSCF in the IMS architecture?

    <p>Selects an S-CSCF in the home network for a user session</p> Signup and view all the answers

    What is the primary function of the S-CSCF in the IMS architecture?

    <p>Interfaces with internal and external service platforms</p> Signup and view all the answers

    What type of media streams does the MRFP process?

    <p>Audio, video, and other media streams, including transcoding and analysis</p> Signup and view all the answers

    What is the primary role of the OSA SCS and IM-SSF in the IMS architecture?

    <p>To act as gateways to other service environments</p> Signup and view all the answers

    What is the purpose of the CSE in IMS?

    <p>To enable legacy Intelligent Network services</p> Signup and view all the answers

    What is the primary function of the OSA application server framework?

    <p>To provide a standardized way for third-party applications to access IMS</p> Signup and view all the answers

    What interfaces with the CSE by CAP?

    <p>IM-SSF</p> Signup and view all the answers

    What type of services can be developed using the OSA application server framework?

    <p>Value-added services developed by third parties</p> Signup and view all the answers

    What is the primary advantage of using the CSE in IMS?

    <p>It enables operators to leverage existing infrastructure for IMS services</p> Signup and view all the answers

    What is the primary function of the IM-SSF?

    <p>To host CAMEL features and interface with the CSE</p> Signup and view all the answers

    What is the primary consideration for IMS deployment?

    <p>Leveraging existing infrastructure</p> Signup and view all the answers

    What is the primary purpose of IMS-based interworking architecture?

    <p>To enable convergence between IP networks and facilitate vertical handoff</p> Signup and view all the answers

    What is the main benefit of IMS in Next Generation Networks (NGNs)?

    <p>Facilitating convergence between IP networks and vertical handoff</p> Signup and view all the answers

    Which component is responsible for routing mobile-to-mobile calls in IMS architecture?

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

    What is the primary role of the IMS in NGNs?

    <p>To facilitate convergence between IP networks and vertical handoff</p> Signup and view all the answers

    Which IMS component is responsible for user registration and re-registration?

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

    What is the primary goal of IMS in NGNs?

    <p>To facilitate convergence between IP networks and vertical handoff</p> Signup and view all the answers

    What is the primary purpose of IMS-based interworking architecture?

    <p>To facilitate convergence between IP networks and vertical handoff</p> Signup and view all the answers

    What is the primary role of IMS in NGNs?

    <p>To facilitate convergence between IP networks and vertical handoff</p> Signup and view all the answers

    Study Notes

    Introduction to IMS

    • IMS (IP Multimedia Subsystem) is a standardized solution in the telecommunications world.
    • It is a new architecture based on new concepts, new technologies, new partners, and ecosystem.
    • IMS provides real-time and non-real-time multimedia sessions over an all-IP network.

    IMS Architecture

    • IMS is divided into three different types of CSCFs (Call Session Control Functions):
      • Serving CSCF (S-CSCF)
      • Proxy CSCF (P-CSCF)
      • Interrogating CSCF (I-CSCF)
    • IMS uses SIP (Session Initiation Protocol) to support signaling and session control for real-time services.

    IMS Components

    • MRFP (Multimedia Resource Function Processor) provides resources to be controlled by the MRFC.
      • Sources media streams (for multimedia announcements)
      • Processes media streams (e.g., audio transcoding, media analysis)
      • Tones and announcements (applied on receipt of ACK, self-timed with BYE, or stopped on BYE)
      • Supports DTMF within the bearer path.
    • 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 accordingly.
    • BGCF (Breakout Gateway Control Function) selects to which PSTN network a session should be forwarded.

    IMS Benefits

    • Offers standardized service enablers and network interfaces for easier interoperability of new multimedia services.
    • Enables operators to create and deliver person-to-person multimedia services in a way that protects the operator business model and generates new revenue.
    • Provides service scalability by combining the best of two worlds: datacom industry and telecom industry.

    IMS Standardization

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

    IMS Call Flow

    • Registration and re-registration process
    • Basic message flow
    • Routing of mobile-to-mobile calls - session initiation

    IMS (IP Multimedia Subsystem)

    • Also known as Multimedia NGN (Next Generation Network)
    • A strategic decision for service providers, not just a network technology decision
    • Can be deployed by traditional service providers or new entities entering the IP services market

    IMS Benefits

    • Offers standardized service enablers and network interfaces for easier interoperability of new MM services
    • Enables creation and delivery of person-to-person MM services while protecting the operator business model and generating new revenue
    • Solves service scalability issues with its architecture
    • Supports composing services and expanding existing ones

    IMS Architecture

    • Combines the best of both datacom and telecom industries
    • Core components include S-CSCF, P-CSCF, and I-CSCF

    S-CSCF (Serving Call State Control Function)

    • Provides session control services for a user
    • Maintains session states for registered users and performs tasks such as:
      • Registration
      • Session control
      • Proxy server
      • Interactions with application servers
      • Other functions (e.g., service-related event notifications, generating Call Detail Records)

    P-CSCF (Proxy Call State Control Function)

    • A mobile's first contact point inside a local IMS
    • Acts as a SIP Proxy Server
    • Performs functions such as:
      • Forwarding SIP requests from a mobile to the mobile's home network
      • Forwarding SIP messages from the network to a mobile
      • Compression and decompression of SIP messages
      • Maintaining a security association with the mobile

    I-CSCF (Interrogating Call State Control Function)

    • An optional function that hides an operator's network internal structure from an external network
    • Serves as a central contact point for sessions destined to a subscriber of that network
    • Selects an S-CSCF for a user's session based on capabilities required by the user

    Application Servers

    • SIP Application Server: provides session control and value-added services
    • Camel Service Environment (CSE): provides legacy Intelligent Network (IN) services
    • OSA Application Server: provides a standardized way for third-party applications to access the IMS

    Flow of Information

    • Registration and re-registration processes involve S-CSCF, P-CSCF, and I-CSCF
    • Basic message flow includes SIP registration, session establishment, and call setup
    • Mobile-to-mobile calls are routed through the IMS architecture

    IMS Overview

    • IMS (IP Multimedia Subsystem) is the technology that will prevail in Next Generation Networks (NGNs) for converging IP networks and facilitating vertical handoff.
    • IMS is also known as Multimedia NGN.

    IMS Architecture

    • IMS provides standardized service enablers and network interfaces for achieving interoperability of new multimedia services.
    • The core of IMS combines the best of two worlds: datacom industry and telecom industry.

    IMS Components

    • Multimedia Resource Function Processor (MRFP): provides resources, sources and processes media streams, and supports DTMF within the bearer path.
    • Multimedia Resource Function Controller (MRFC): interprets signaling information and controls media streams resources in MRFP.
    • Breakout Gateway Control Function (BGCF): selects the PSTN network for a session and forwards session signaling to MGCF and BGCF in the destination PSTN network.

    Service Architecture

    • The service architecture involves a SIP request from a mobile, which travels from the originating mobile to the visited P-CSCF, then to the I-CSCF (if used) in the originating mobile's home network.
    • The I-CSCF selects an S-CSCF in the home network for the user session and forwards the SIP request.
    • The S-CSCF interfaces with internal and external service platforms using the ISC interface and the signaling protocol is SIP.

    IMS Standardization

    • IMS was initially standardized by 3GPP as part of Release 5 specifications, targeted at supporting non-real-time services.
    • Release 6 supports real-time services, and Release 7 extends IMS scope to any IP access network, including fixed access networks.

    IMS Benefits

    • IMS offers standardized service enablers and network interfaces for achieving interoperability of new multimedia services.
    • IMS enables service scalability, supports composing services and expanding existing services, and protects the operator business model while generating new revenue.

    IMS Types of CSCFs

    • Serving CSCF (S-CSCF)
    • Proxy CSCF (P-CSCF)
    • Interrogating CSCF (I-CSCF)

    IMS Overview

    • IMS (IP Multimedia Subsystem) is a new architecture that provides real-time and non-real-time multimedia sessions over an all-IP network.
    • It targets convergence of services supplied by different types of networks, including fixed, mobile, and Internet.
    • IMS is standardized by the 3rd Generation Partnership Projects (3GPP).

    IMS Standardization

    • IMS was initially standardized by 3GPP as part of its Release 5 specifications, targeting non-real-time services.
    • Release 6 targets real-time services.
    • Release 7 extends IMS scope to any IP access network, including fixed access networks, wireless local area networks (WLANs), and wireless metropolitan area networks (WiMAX).

    IMS Architecture

    • IMS provides all network entities and procedures to support real-time voice and multimedia IP applications.
    • It uses SIP (Session Initiation Protocol) to support signaling and session control for real-time services.
    • IMS architecture consists of three types of CSCFs (Call Session Control Functions):
      • Serving CSCF (S-CSCF)
      • Proxy CSCF (P-CSCF)
      • Interrogating CSCF (I-CSCF)

    Service Platforms

    • There are three types of standardized platforms:
      • SIP Application Server
      • Open Service Access (OSA) Service Capability Server (SCS)
      • IP Multimedia Service Switching Function (IM-SSF)
    • S-CSCF interfaces with internal and external service platforms.
    • OSA SCS and IM-SSF are gateways to other service environments.

    SIP Application Server

    • A SIP server can provide various value-added services.
    • A lightweight SIP-based server enables the CSCF to utilize SIP-based services and interact with ISP application servers without additional components.

    Camel Service Environment (CSE)

    • CSE provides legacy Intelligent Network (IN) services.
    • It allows operators to leverage existing infrastructure for IMS services.
    • CSE interacts with the CSCF through IM-SSF.

    OSA Application Server

    • OSA application server framework provides a standardized way for third-party applications to access the IMS.
    • The OSA application server interfaces with the CSCF through the OSA SCS by OSA API.

    Multimedia Resource Function (MRF)

    • MRF consists of two components:
      • Multimedia Resource Function Processor (MRFP)
      • Multimedia Resource Function Controller (MRFC)
    • MRFP provides resources to be controlled by the MRFC.
    • MRFC interprets signaling information from an S-CSCF or a SIP-based Application Server and controls the media streams resources in the MRFP accordingly.

    Breakout Gateway Control Function (BGCF)

    • BGCF selects the PSTN network to which a session should be forwarded.
    • It is responsible for forwarding the session signaling to the appropriate MGCF and BGCF in the destination PSTN network.

    Learning Objectives

    • Learn about the Architecture of IMS
    • Understand different working elements of IMS Core
    • Learn about IMS interfaces
    • Learn about Application Servers to provide functionality
    • Learn about Basic Call Flow in IMS

    Learning Objectives

    • Learn about the Architecture of IMS
    • Understand the working elements of IMS Core
    • Identify IMS interfaces
    • Understand Application Servers to provide functionality
    • Learn Basic Call Flow in IMS

    Introduction

    • Successful services are available on the Internet, including email, web browsing, chat, audio/video downloading/streaming, and internet telephony
    • Operators face the problem of subscriber churn due to cheap/free calls over the internet provided by new service providers
    • To retain subscribers, operators need to offer differentiation in personalization, service bundling, co-branding, business-to-business relations, tariffs, single sign-on, and quality of service

    What is IMS?

    • IMS (IP Multimedia Subsystem) is a standardized solution in the telecommunications world
    • IMS provides real-time multimedia sessions (voice, video, conference) and non-real-time multimedia sessions (Push to talk, Presence, instant messaging) 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
    • Service Integration
    • Keeps charging with user relation
    • Ease of use and Security
    • Controlling CAPEX and OPEX

    IMS Standardization

    • Initially standardized by 3GPP as part of Release 5 specifications
    • Release 6 targeted at supporting real-time services
    • Release 7 standardization for any IP access network, including fixed access networks (e.g., DSL)

    IMS Architecture

    • IMS provides network entities and procedures to support real-time voice and multimedia IP applications
    • Uses SIP to support signaling and session control for real-time services
    • CSCFs can be divided into three types: Serving CSCF (S-CSCF), Proxy CSCF (P-CSCF), and Interrogating CSCF (I-CSCF)
    • Multimedia Resource Function Processor (MRFP) provides resources to be controlled by the MRFC
    • Multimedia Resource Function Controller (MRFC) interprets signaling information from an S-CSCF or a SIP-based Application Server and controls the media streams resources in the MRFP accordingly
    • Breakout Gateway Control Function (BGCF) selects to which PSTN network a session should be forwarded

    Service Architecture

    • The S-CSCF is responsible for interfacing with internal and external service platforms
    • Three types of standardized platforms: SIP application server, Open Service Access (OSA) Service Capability Server (SCS), and IP Multimedia Service Switching Function (IM-SSF)

    SIP Application Server

    • Provides various value-added services in addition to session control
    • A lightweight SIP-based server enables the CSCF to utilize the SIP-based services and interact with the ISP application servers without additional components

    Camel Service Environment (CSE)

    • Provides legacy Intelligent Network (IN) services
    • Allows operators to leverage existing infrastructure for IMS services
    • The CSCF interacts with CSE through IM-SSF

    OSA Application Server

    • Provides a standardized way for a third-party to secure access to the IMS
    • Interfaces with the CSCF through the OSA SCS by OSA API (Application Programming Interface)

    Examples of Flow of Information

    • Registration and Re-Registration
    • Basic Message Flow
    • Routing of Mobile-To-Mobile Calls - Session Initiation

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    Related Documents

    W4_JTO_Ph2_Datacom_IT-part-13.pdf

    Description

    Learn about IMS, a standardized solution for telecommunications, and its architecture comprising three types of CSCFs. Understand how IMS enables real-time and non-real-time multimedia sessions over an all-IP network.

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