文档介绍：
Definition
is a standard that specifies ponents, protocols and procedures that
provide munication services—real-time audio, video, and data
communications—over works, including protocol (IP)–based
networks. is part of a family of ITU–T mendations called that
provides munication services over a variety works.
Overview
This tutorial discusses the protocol standard. is explained with an
emphasis on gateways and gatekeepers, which ponents of an
network. The call flows between entities in an are explained, and
the interworking aspects of with family protocols are discussed.
Topics
1. What Is ?
2.
3. Zone
4. Protocols Specified by
5. Terminal Characteristics
6. Hardware Platform
7. Registration, Admission, and Status
8. Signaling and Control Signaling
9. Connection Procedures
10. Interworking with Other works
Self-Test
Correct Answers
Acronym Guide
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International Engineering Consortium
1. What Is ?
The standard is a cornerstone technology for the transmission of real-time
audio, video, and munications over packet-works. It specifies
ponents, protocols, and procedures providing multimedia
communication over packet-works (see Figure 1). Packet-based
networks include IP–based (including the ) or packet exchange
(IPX)–based local-works (LANs), works (ENs),
metropolitan-works (MANs), and wide-works (WANs).
can be applied in a variety of mechanisms—audio only (IP telephony); audio and
video (videotelephony); audio and data; and audio, video and data. can
also be applied to multipoint-munications. provides
myriad services and, therefore, can be applied in a wide variety of areas—
consumer, business, and entertainment applications.
Figure 1. Terminals on a work
Versions
The standard is specified by the ITU–T Study Group 16. Version 1