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64 CHAPTER 3: MANAGING VCX SERVERS
delete :- Remove an authorized station entry
quit:- exit this utility
help:- show commands that are supported
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supported commands are "show", "add", "delete", "quit",
"help"::
■ To add an SNMP management station, enter add. The script
prompts you to enter the IP address and network mask of the
management station you want to add.
■ To delete an existing SNMP management station, enter delete.
The script prompts you to enter the IP address and network mask
of the management station you want to delete.
■ To display a list of the SNMP stations currently allowed access to
this server, enter
show.
Changing Codecs Before voice traffic can be transmitted over a digital network, the audio
waveform, an analog signal, must be encoded into a digital format. The
digitized audio is packetized and delivered over the network to a
destination, and then decoded back into a voice waveform. Software
called a codec (coder/decoder) converts the audio information between
digital and analog formats.
Digitized audio formats have different properties. Each format represents
a compromise between bandwidth and audio quality, that is, high quality
audio typically requires more network bandwidth. Compressing the
digitized audio data can conserve bandwidth with little compromise in
audio quality, but compression requires increased processing overhead
when encoding and decoding the audio information. Too much
processing overhead can introduce delay.
IP Messaging can operate with either the G.711u codec or the G.729a
codec.
Each codec includes a set of language prompts. By default, IP Messaging
operates with the G.711u codec and US English language prompts.
Each set of language prompts, available with the G.711u codec or the
G.729a codec, is constructed as RPM Package Manager package. For
example, IP Messaging provides the following two RPMs for UK English:
■ IPMSG-UK-EN-G711u-SPEAK-1-1.i386.rpm
■ IPMSG-UK-EN-G729a-SPEAK-1-1.i386.rpm