IMS Explained

Course Fee : 7000 INR Start Date : Jul 17, 2017 - End Date : Jul 20, 2017 | Location : Gurgaon,Haryana


Name: IMS Explained

Target Audience.

This course is intended for someone who is working on GSM, Circuit switched & Packet switched products and who wish to learn earn IMS concepts, architecture and functions.

Training Objective                               

  • IMS Architecture and Interfaces
  • Basic Concepts
  • IMS solutions – VoLTE, PES,SRVCC
  • IMS core Enablers
  • IMS protocols – SIP,Dimater,H.248.RTP
  • Signalling procedures
  • IMS Core Enablers – (P/I/S-CSCF),MRFC
  • MRFP.IM-MGW, Application Servers
  • Call flows & Procedures – Registration, IMS  to IMS,IMS-PLMN/PSTN
  • Policy Control procedures
  • Charging in IMS


Duration of Training

4 days


Should have basic understanding of GSM – CS/PS,LTE

Should have basic understanding of SIP and IP protocol

Should have understanding SS7/ SIGTRAN




1.   IMS Evolution, Architecture Basic concepts


  • Telecom Evolution – 3GPP Release (R97-R10)
  • Importance of Voice over IP and Next Generation Networks
  • Introduction to IP Multimedia Subsystem (IMS)
  • The business drivers for IMS,IMS Opportunities and Challenges
  • Benefits and Flexibility with IMS
  • MS Standardization: 3GGP, 3GPP2, TISPAN,OMA,IETF
  • Convergence of Mobile networks – Fixed Mobile Convergence
  • IMS Layers - Access Layer, Transport Layer, Control Layer, Application Layer
  • IMS specific Identifiers – IMS Identifiers – IMPI,IMPU,SIP URI,TEL URI,PSI
  • Basic IMS Principle for Mobile Access
  • Architecture of the 3GPP IMS Network (IMS Core)
  • IMS Interfaces and Protocols – SIP,H.248,Diameterm,RTP
  • Various IMS Solutions – VoLTE, SRVCC, POTS Emulation (PES)


2. IMS Core (Detailed)


  • IMS Core Enablers – (P/I/S-CSCF),
  • AS-MMtel Server (Detailed Description) ,3rd party Registration
  • IMS service capability layer (IM-AS,IM-SSF,OSA-SCS)
  • Role of DNS/ENUM in IMS
  • MGCF ,IM- MGW (IMS – PLMN/PSTN Interworking)
  • SS7/SIGTRAN Overview & Protocol stack
  • IMS Media Enablers MRFC/MRFP (Media Controller and processor)
  • Relevance of RTP protocol and Codec Negotiation
  • IMS Basic call Flow – MO/MT
  • IMS Numbering and addressing
  • C-SCSF Functions, Registration, De-registration
  • P-CSCF Interactions, Emergency call Handing
  • I-CSCF (MT Router) ,Topology Hiding
  • Use of SBC( Session Border Controller ) A-SBC,I-SBC
  • Charging Principles in IMS -Online(OCS) and Offline charging(OCS)
  • Charging interfaces- Rf ,Ro
  • Relevance of ICI,IOI
  • ACR and CDR



3.   Session Initiation Protocol (SIP)


  • SIP functions and protocol stack
  • SIP functions SIP message transport protocols – UDP,SCTP,TCP
  • SIP architectural elements
  • SIP syntax, SIP session setup example
  • SIP transactions and SIP dialogues
  • Request messages and their layout
  • Standard SIP messages
  • Response messages and their layout
  • SIP call flows
  • Routing relevant information
  • SIP URI domain name resolution
  • SIP registrations SIP De-registration
  • SIP message body - Session description protocol(SDP)
  • SIP message body headers
  • SDP tasks and function
  • Session description parameters
  • SIP Response Codes – 1xx,2xx,3xx,4xx,5xx,6xx


4. Diameter Protocol, PCC, Policy & QoS Mechanism


  • Cx/Dx/Sh/Dh Diameter Applications
  • Diameter Base Protocol and Cx/Dx/Sh/Dh Diameter Applications
  • Diameter Base Protocol, Diameter message layout, AVP layout
  • Request - answer model and response codes
  • Use of Diameter – Authentication ,Authorization and Accounting Procedures
  • Use of Diameter Protocols and its applications in IMS ( UAR,UAA,MAR,MAA,SAR,SAA)
  • S6a/S6d Overview, Procedures
  • Policy and Charging Control (PCC) over the Gx and Rx Interface
  • Rx and Gx Diameter Application specific Signaling Flows (IPCAN – VoLTE)


  1. Call Flows (IMS-IMS, PSTN Gateways, Charging) and IMS Road Map


  • ISUP call flow
  • Role of IMS MGW for IMS to PLMN /PSTN Interworking
  • Call Flows – IMS to IMS call flow, IMS to PSTN,PSTN to IMS
  • Media Negotiation call flow
  • IMS IVR and Conference call Flows -(Interaction between AS ,MRFC,MRFP)
  • Use of XML- VXML,MSML
  • H.248 Request for Media Resource mgt.(ADD ,MOD,SUBTRACT of H.248 Resources)
  • IMS interaction with BSS/OSS Layer
  • Post-paid charging call flow, creation and transfer of charging records to BC(billing system)
  • Road maps for IMS

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