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Megaco/H.248
User's Guide
Version 3.14

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Chapters

• Introduction
  • Top of chapter
  • Scope and Purpose
  • Prerequisites
  • About This Manual
  • Where to Find More Information
• Architecture
  • Top of chapter
  • Network view
  • General
  • Single node config
  • Distributed config
  • Message round-trip call flow
• Running the stack
  • Top of chapter
  • Starting
  • MGC startup call flow
  • MG startup call flow
  • Configuring the Megaco stack
  • Initial configuration
  • Changing the configuration
  • The transaction sender
  • Segmentation of transaction replies
• Internal form and its encodings
  • Top of chapter
  • Internal form of messages
  • The different encodings
  • Configuration of Erlang distribution encoding module
  • Configuration of text encoding module(s)
  • Configuration of binary encoding module(s)
  • Handling megaco versions
  • Encoder callback functions
• Transport mechanisms
  • Top of chapter
  • Callback interface
  • Examples
• Implementation examples
  • Top of chapter
  • A simple Media Gateway Controller
  • A simple Media Gateway
• Megaco mib
  • Top of chapter
  • Intro
  • Statistics counters
  • Distribution
• Performance comparison
  • Top of chapter
  • Comparison of encoder/decoders
  • System performance characteristics
  • Description of encoders/decoders
  • Setup
  • Summary
• Testing and tools
  • Top of chapter
  • Tracing
  • Measurement and transformation

5 Transport mechanisms

5.1  Callback interface

The callback interface of the transport module contains several functions. Some of which are mandatory while others are only optional:

• send_message - Send a message. Mandatory

• block - Block the transport. Optional

  This function is usefull for flow control.

• unblock - Unblock the transport. Optional

For more detail, see the megaco_transport behaviour definition.

5.2  Examples

The Megaco/H.248 application contains implementations for the two protocols specified by the Megaco/H.248 standard; UDP, see megaco_udp, and TCP/TPKT, see megaco_tcp.