pdf_gross.gifH.248 / BICC in the Circuit Swiched Core Network - Trouble Shooting and Protocol Analysis

[3-day course, Euro 3,450.- (net) per participant]

backtotop.gifINTRODUCTION AND PROTOCOL OVERVIEW

Course Description

  • Review of the Protocol Architecture
    • Circuit Switched Core Network Interfaces and Components changes release 4/5 (reason for introduction of Media Gateway / MSC server, their consequences to transport network layer architecture.
    • Different possibilities in CN architecture regarding interconnection of MSC server, Media Gateway.
  • Overview of the Protocol stacks in the CS –CN
    • The Nb interfac (ATM based and IP Alternative)
    • The Nc Interface (ATM based and IP Alternative)
    • The Mc Interface
    • The Transport Network Control Plane
  • Considering QoS in IP based Networks
    • QoS Hierarchy and End to End View
    • IP related QoS Technologies
    • Why MPLS as QoS mechanism?
  • The Future: All-IP based Network Architecture & SIP
    • The IP bearer and SIP / IMS for session setup and control.
  • Practical Workshop:
    • Introduction to the workshop environment.
    • Protocol Tracing with Wireshark / Ethereal.
    • Configuration of Filters, how to select the required pieces of information.
    • Example: Trace Analysis with a simple call setup over IP.
    • Identify the architectural differences, mappings and common functionalities in detail

backtotop.gifBICC / ISUP IN THE CIRCUIT SWITCHED CORE NETWORK

  • Overview of ISUP and BICC
    • Functional Overview, Protocol Stack in 3GPP Rel.4
    • Discussion of ISUP / BICC use cases
    • Which are the important differences?
  • Detailed Review of BICC
    • Functional Overview, Protocol Stack in 3GPP Rel.4
    • BICC Message Header Details
    • Mandatory Information Elements, fixed and variable length
    • Optional Information Elements
    • Review of important BICC Messages – IAM, COT, ACM, ANM, REL, RLC, APM
    • Overview of Supplementary Services and Additional Functions / Services
    • Signaling Identifiers used by BICC – Protocol, Network, Connection and Group ID's.
    • Timer Overview
  • Successful Basic Call Setup Procedure
    • call setup, En bloc operation, overlap operation, outgoing and incoming bearer setup cases
    • Forward / Backward Bearer Establishment
    • conversation phase, Suspend and Resume, Forward Transfer, codec modifications and negotiations
    • clear down, release by sender, release by receiver, release by the network
  • Practical Workshop
    • Discussion of a BICC log file sample
    • Completion of a basic call setup message flow by the students.
  • Unsuccessful Call Setup Actions
    • Actions at CSF, CN, CMN
    • Tones and Announcements
  • Review of Abnormal Conditions
    • CIC and Group reset procedures
    • Handling of unreasonable signaling, message format errors, unexpected messages or parameters, BICC error indication, over length messages
    • BICC Timer Expiries, overview, identification and use of timers
  • Interworking
    • BICC Interworking
    • Interworking with ISUP
    • Interworking with other signaling systems and user parts
    • H.248 Functions for Remote Media Control, mandatory functions, optional functions
  • Practical Workshop
    • Discussion of detailed scenarios, Forward and backward bearer establishment, bearer control tunneling, Codec negotiation and collision case, per call bearer establishment, bearer release scenario.

backtotop.gifHOW TO CONTROL MEDIA GATEWAY RESOURCES

  • Overview of H.248 / MEGACO
    • Media Gateway Operation Principles
    • Contexts and Terminations
  • Details of H.248
    • The H.248 / MEGACO Command Set – Status, Configuration and Report commands
    • H.248 detailed message encoding – ADD, MOVE, MOD, SUB, NOTIFY, AUDIT and SERVICE_CHANGE commands, Descriptors for Media, Modem, Mux, Events, Signals and more.
      Analysis of H.248 header, transaction encoding, action request encoding, ADD Request encoding examples.
    • Package Definitions, Properties, Events, Signals, Statistics, Procedures
    • Tags for Media Stream properties, MUX, bearer, ATM, IP
  • Practical Workshop:
    • Completion of a given message flow scenario by the student, identification of messages and parameters as an exercise.
    • Description of the scenario, i.e. what is happening?
  • Encoding of H.248 Messages
    • ASN.1 Basic Encoding Rules, TLV Encoding, Packet Encoding
    • Encoding Example H.248 ADD Request
  • Practical Workshop:
    • Decode of a H.248 MOD Request Message by the Students
  • Security Considerations
    • Protection schemes, protocol and media
    • Authentication Header scheme
  • Transport over IP
    • Application level framing
    • Timer handling, RTT, provisional responses
    • Use of TCP and SCTP
  • Practical Workshop:
    • Review of logfiles captured at the Mc interface
    • Analysis and completion of a given message flow, allocate context, common codecs, connection points.
    • Discuss possible of error cases.
  • Review of RTP / SRTP / RTSP / RTCP
    • Operation Overview of RTP and RTCP
    • Review of the RTP Header Format – CSRC, SSRC, Timestamp, Sequence Number, Payload Types
    • Tasks and Functions of RTCP
    • Review of RTP and RTCP Log-Files
  • Practical Workshop:
    • Review of RTP / RTCP files with Ethereal / Wireshark
    • Analysis of the content, reproduction of voice samples.
    • Discuss security and content encryption issues.

backtotop.gifSELECTED BICC – H.248 SCENARIOS

  • Mobile Originating Call Establishment
    • Review and discussion of the detailed message flow
  • Practical Workshop:
    • Analysis of a MEGACO log file for MOC establishment
    • Identification of MGW parameters by the students
  • Mobile Terminating Call Establishment
    • Review and discussion of the detailed message flow
  • Practical Workshop:
    • Analysis of a MEGACO log file for MTC establishment
    • Creation of the detailed flow diagram by the students
  • SRNC Relocation
    • Review and discussion of the detailed message flow
  • Practical Workshop:
    • Analysis of a MEGACO log file for SRNC Relocation
    • Generation of ID lists for each network element by the students
  • Subsequent Handover
    • Review and discussion of the detailed message flow
  • Practical Workshop:
    • Analysis of a MEGACO log file for Subsequent Handover
    • Summary and identification of all used parameters by the students
  • Inter MSC Handover
    • Review and discussion of the detailed message flow
  • Practical Workshop:
    • Analysis of a MEGACO log file for Inter MSC Handover
    • Creation of a detailed flow diagram by the students

v1.4

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