Tms Subsystem; Media Gateway Control Protocol (Megaco/H.248) - Zte zxmsg 5200 Technical Manual

ZXMSG 5200 (V2.0.2) Multiplex Service Gateway Technical Manual
Introduction
Functions
MMegaco/H.24
8 Commands
12 Confidential and Proprietary Information of ZTE CORPORATION

TMS Subsystem

TMS subsystem is an outsourced software package to complete
the switch management functions. OS vendor provides TMS so it
is functionally independent and closely related to OS.
Media Gateway Control
Protocol (Megaco/H.248)
The Media Gateway Control Protocol (Megaco) is a result of joint
efforts of the IETF and the ITU-T Study Group. Therefore, the
IETF defined Megaco is the same as ITU-T Recommendation
H.248.
Megaco/H.248 addresses the relationship between the Media
Gateway (MG), which converts circuit-switched voice to packet-
based traffic. Megaco/H.248 instructs Media Gateway, to connect
Packet Data Network (PDN) packet stream to Real-Time
Transport Protocol (RTP) packet. Megaco/H.248 architecture is
similar to Media Gateway Control Protocol (MGCP) and the
controller-to-gateway relationship, but Megaco/H.248 supports a
broader range of networks, such as ATM.
There are two basic components in Megaco/H.248: terminations
and contexts. Terminations represent streams entering or
leaving the MG such as analog telephone lines, RTP streams, or
MP3 streams. Terminations have properties, such as the
maximum size of a jitter buffer, which can be inspected and
modified by the Media Gateway Controller (MGC).
Terminations are placed into contexts, when two or more
termination streams
Contexts are created and released by the MG under command of
the MGC. A context is created by adding the first termination,
and it is released by removing (Subtracting) the last termination.
For more than one stream termination, context provides multi-
stream context. Audio, video, and data streams may exist in a
context among several terminations.
Protocol Structure - Megaco/H.248 (Media Gateway Control
Protocol)
Megaco/H.248 uses a series of commands to manipulate
terminations, contexts, events, and signals. The following is a
list of the commands:
1. Add - The Add command adds a termination to a context.
The Add command on the first Termination in a Context is
used to create a Context.
2. Modify - The Modify command modifies the properties,
events, and signals of a termination.
are mixed and connected together.