AddPac VoiceFinder AP2120 User's Guide Page 165

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VoiceFinder AP2120 VoIP Gateway User’s Guide Version 1.00
AddPac Technology Co., Ltd. -
165 -
Chapter 5 Voice Configuration and Command
This chapter explains voice configuration and commands to operate voice
integration function of VoiceFinder AP2120.
5.1. Voice Technologies and Concepts
5.1.1. Voice Over IP
Voice over IP enables a VoIP Gateway to carry voice traffic (for example,
telephone calls and faxes) over an IP network. In Voice over IP, the DSP
segments the voice signal into frames, which are then coupled in groups of two
and stored in voice packets.
These voice packets are transported using IP in compliance with ITU-T
specification H.323.
Because it is a delay-sensitive Application, you need to have a
well-engineered network end-to-end to successfully use Voice over IP.
Fine-tuning your network to adequately support Voice over IP involves a series
of protocols and features geared toward quality of service (QoS). Traffic
shaping considerations must be taken into account to ensure the reliability of
the voice connection.
All the commands used AP2120 can be used either by Console or Telnet.
Voice over IP is primarily a software feature; however, to use this feature on a
VoIP Gateway, you must install a voice interface cards (AP-FXS, AP-FXO,
AP-E&M), each of which is specific to a particular signaling type associated
with a voice port.
5.1.2. Codecs and MOS(Mean Opinion Score)
Codec(Coder-Decoder) codes analog voice signal to digitial bit stream and
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