1 Introduction
Megaco/H.248 is a protocol for control of elements in a
physically decomposed multimedia gateway, enabling separation of
call control from media conversion. A Media Gateway Controller
(MGC) controls one or more Media Gateways (MG).
This version of the stack supports version 1, 2 and 3 as
defined by:
-
version 1 - RFC 3525 & H.248-IG (v10-v13)
-
version 2 - draft-ietf-megaco-h248v2-04 & H.248.1
v2 Corrigendum 1 (03/2004)
-
version 3:
-
prev3a - as defined by TD-33 (except segments)
-
prev3b - TD-33 updated to be backward compatible with v2
(except segments)
-
prev3c - As defined by ITU H.248.1 (09/2005)
(except segments)
The semantics of the protocol has jointly been defined by two
standardization bodies:
-
IETF - which calls the protocol Megaco
-
ITU - which calls the protocol H.248
1.1 Scope and Purpose
This manual describes the Megaco appliacation, as a component
of the Erlang/Open Telecom Platform development environment. It
is assumed that the reader is familiar with the Erlang
Development Environment, which is described in a separate User's
Guide.
1.2 Prerequisites
The following prerequisites is required for understanding the
material in the Megaco User's Guide:
-
the basics of the Megaco/H.248 protocol
-
the basics of the Abstract Syntax Notation One (ASN.1)
-
familiarity with the Erlang system and Erlang programming
The application requires Erlang/OTP release R10B or later.
1.3 About This Manual
In addition to this introductory chapter, the Megaco User's
Guide contains the following chapters:
-
Chapter 2: "Architecture" describes the architecture
and typical usage of the application.
-
Chapter 3: "Internal form and its encodings" describes
the internal form of Megaco/H.248 messages and its various
encodings.
-
Chapter 4: "Transport mechanisms" describes how
different mechanisms can be used to transport the
Megaco/H.248 messages.
-
Chapter 5: "Debugging" describes tracing and debugging.
1.4 Where to Find More Information
Refer to the following documentation for more information about
Megaco/H.248 and about the Erlang/OTP development system:
megaco 3.6.0.1
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Ericsson AB