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Support Services &IP Multimedia Subsystem (IMS)
T-110.7111 - Internet Technologies for Mobile Computing
Name – Koushik AnnapureddyStudent Number – 84973F
Support Technologies
IP Multimedia Subsystem (IMS)
Session Initiation Protocol (SIP)
IP Television ( IPTV )
Security and Trust
Charging and Billing
Why IMS ? 3G Networks have a Packet Switched Domain to perform
data communications.
User can surf the content and can do anything as in the case of ISDN,DSL.
Requirements –
Quality of Service
Charging
Faster Development of Services ( Reusable Components )
IMS Architecture
IMS as a Business model. Provides Integrated services to users. Operators want to use services
developed by third parties, combine them, integrate them with services they already have, and provide user with completely new service
Protocols
Keeps signaling and media paths separate.Access – independent – WLAN,ADSL,HFC,3G..
SIP – Client – Server model (SMTP, HTTP). Can use CGI and Java Servlets.
AAA (Authentication, Authorization and Accounting) – Diameter.
COPS , RTP , RTCP
Benefits of IMSOperators : Competitive advantages.Reduced time to marketLower deployment costs.Value chain control.
End Users: Services & interaction.Integrated rich media ( text,audio,video ) in
the same call.Mobile Fixed InternetworkingPersonalized communications.
SERVICES AND APPLICATIONS IN IMS
Multi-Device Video StreamingIP TVPrioritized PresenceInteractive ApplicationsVideo ConferencePush to Talk Over Cellular (PoC)
IPTV Today’s solutions –Web TVP2P TV
Need for IMS in IPTV solutions – Framework for IPTV service control, user profiles, charging
(pay per view ) , QOS. Convergence of IMS and TV services Access to TV services through different bearers ( DSL,
UMTS , WLAN , DVB-X ) AAA Services
IPTV Framework via IMS
What is SIP ?SS7 is to the mobile telephony, SIP is to the Internet. Create , Modify and Terminate Sessions( Text, Voice,
Video ).
User location User capabilitiesUser availabilityCall setupCall handling
SIP Entities
User Agents - User Agent Client ( UAC ) User Agent Server (UAS)
Network Servers – Proxy Server Redirect Server Registrar
Presence, Instant Messaging and Voice
Charging & BillingAccounting –
Capacity & Trend Analysis Cost Allocation Auditing Charging and Billing
IMS uses the Diameter protocol to transfer the accounting information that charging in IMS is based on.
CSCF, GGSN inform the charging system about media activity during those sessions.
IMS Event based Charging – Offline event based Online event based
Session Based Charging – Offline Session based Online Session based
Security and Trust
IMS is an overlay network on top of existing network protocol stack, specifically IP, and uses SIP as a generic building block.
IP – Route hijacking, denial of service, source address spoofing.
IMS inherits the security issues of IP and SIP .
Security Threats
Toll fraud Denial of ServiceSession hijackingAddress spoofingAuthentication and End – End SecurityPrivacyMalwareEnergy Consumption
References 1) Ericsson. IMS – IP Multimedia Subsystem. White Paper,
October 2004.2) G. Camarillo and M. Garcia-Martin. The 3G IP multimedia
subsystem(IMS): merging the Internet and the cellular worlds. Wiley, 2nd edition,2006.
3) R. L. Chen, E. C. Su, V. S. Shen, and Y.-H. Wang. Introduction to IPMultimedia Subsystem (IMS), Part 1: SOA Parlay X Web services. IBM developerWorks, September 2006.
4) Kuhn, R.: Security considerations for voice over IP systems.5) IP Multimedia Subsystem (IMS); stage 2. 3GPP TS 23.228,
Release 7 2006.6) H. Schulzrinne, G. Camarillo, A.R. Johnston, J.Peterson, R.
Sparks, M. Handley and E. Schooler. SIP: Session Initiation Protocol. IETF RFC 3261, June2002.
Thank you Any questions
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