H.248 Megaco for Developers and Implementers

2 Day Course
Code PWL027

This course has been retired. Please view currently available Next Generation Network Training Courses.


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Multimedia Services over Packet Networks (16 topics)

  • What counts as multimedia
  • Carrying voice over IP
  • RTP and RTCP
  • Encoding
  • H.323 Architecture
  • Zones
  • Endpoints
  • Terminals and Media Gateways
  • Media Gateway Controller
  • Multipoint Control Unit
  • Residential Gateways
  • Interfacing to SS7 with Signalling Gateway
  • Trunking Gateways
  • H.225, H.245, H.235, H.450
  • Evolution of SIP
  • Megaco and H.248

Megaco Connection Model (9 topics)

  • Contexts and Terminations
  • Attributes of a Context
  • Creating and deleting contexts
  • Multiplexed termination
  • Using Contexts and terminations to build calls
  • Identities for Terminations
  • Packages
  • Termination property Descriptors
  • Root Termination

Megaco Commands (30 topics)

  • Add
  • Modify
  • Subtract
  • Move
  • AuditValue
  • AuditCapabilities
  • Notify
  • Service Change
  • Command Descriptors
  • Media Descriptors
  • Termination State Descriptor
  • Logical Control Descriptor
  • Local and Remote Descriptors
  • Signals Descriptor
  • Audit Descriptor
  • Service Change Descriptor
  • Mapping Numbers
  • Digit Maps
  • Digit Map Timers
  • Digit Map Syntax
  • Completion Events
  • Digit Map Activation
  • Using Wild Cards
  • Statistics Descriptor
  • Packages Descriptor
  • Observed Events
  • Topology Descriptors
  • Building Conferences with differing flows
  • Isolate, Oneway and Bothway descriptors
  • Error Descriptor

Command Application Programming Interface (12 topics)

  • Add
  • Modify
  • Subtract
  • Move
  • Audit Value
  • Command Syntax
  • Audit Capabilities
  • Notify
  • Service Change Methods
  • Graceful, Forced, Restart, Disconnected, Handoff and Failover
  • Manipulating and Auditing Context Attributes
  • Transactions

Reliable Transport Mechanisms (13 topics)

  • Reliable Transport
  • Ordering Commands
  • Security considerations
  • Media Gateway Controller Failure and Fail-over
  • Character encoding of the protocol transfer
  • Binary coding of protocol transfer
  • Application Level Framing over UDP
  • Providing At-Most-Once functionality
  • Transaction identifiers
  • Three-way handshake
  • Computing retransmission timers
  • Repeating Requests, Responses and Acknowledgements
  • Using TCP

Session Description Protocol (7 topics)

  • Describing Media Sessions with SDP RFC 2327
  • Session Timing
  • Session Description
  • Version, owner, bandwidth
  • Time Description
  • Media Descriptions
  • SDP Example

Basic Packages (10 topics)

  • Generic Package
  • Base Root Package
  • Tone Generator and Detection
  • Basic DTMF Generator and Detection
  • Call Progress Tones Generator and Detection
  • Analogue Line Supervision Package
  • Basic Continuity Package
  • Network Package
  • RTP Package
  • TDM Circuit Package

Example Call Flows (3 topics)

  • Call between two Residential Gateways
  • Call between Residential Gateway to SIP user
  • Call using Supplementary Services

Review and Evaluation


Delegates should have attended Multiservice Access and H.248, or have similar knowledge and experience. Delegates should also have a very solid understanding of IP, VoIP and WAN technologies.

What Our Customers Say

The training was delivered with a high level of expertise and excellence. Instructor was highly knowledgeable.”

Technical Trainer, Aviat Networks

Overall the course was really good, the trainer really understood the material and was very approachable.”

Customer Training Manager, Aviat Networks

Excellent course, informative and well-paced.”

CSE, Cisco

Course was very well outlined. Topics were great and bridged many gaps.”

System Engineer, Cable & Wireless

An excellent intro to video encoding & MPEG transport streams - I would definitely recommend it.”

Broadcast Engineer, Cisco

Definitely an excellent intro. Left me interested in learning more.”

Broadcast Engineer, Eircom

Excellent training course with real examples and practical classroom demonstrations.”

Transport Designer, Orange

Instructor knowledge and experience was excellent.”

Solutions Engineer, Akamai

Excellent course, very clear and well organised. Course content delivery was very good.”

Assistant Engineer, Dhiraagu

Very informative and appropriate.”

Network Support Technician, BT

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