3Com VCX V7000, Maintenance Manual

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Changing Codecs 65
If you want to enable a set of language prompts that are compatible with
the currently operating codec, simply run the add_language utility as
described in “Adding a Set of Language Prompts” in the
IP Messaging
Module Operations and System Administration Guide.
IP Messaging supports only one codec at a time.
■
If you want your IP Messaging system to operate with a different
codec (for example, switch from the default G.711u codec to the
G729a codec), you must run the change_codec utility, as described in
How to Change Your Codec .
■
If you want to convert custom recorded prompts and saved voice mail
from on codec to another, you must run the codec_data_convert
utility, as described in
Converting Prompts and Messages to a Different
Codec .
How to Change
Your Codec
When you change the codec used on an IP Messaging system, you must
make the change on both the primary IP Messaging server and the
secondary IP Messaging server.
CAUTION: If you configure an existing IP Messaging system to use a
different codec, all custom prompts and voice mail messages saved in the
previous codec format will be lost. To avoid this loss, run the
codec_data_convert utility before running the change_codec utility. See
Converting Prompts and Messages to a Different Codec .
The following example assumes the IP Messaging system is operating
with the default codec (G.711u) and the default set of language prompts
(US English). The steps in the example install the G.729a codec and
enable UK English language prompts.
1 Log in to the primary IP Messaging server using the root account.
2 Enter the following command to switch to the IP Messaging installation
directory:
cd /opt/installtemp
Note that if you have upgraded your IP Messaging system, new files are
located in
/opt/installtemp/upgrade_7.1.yc
.
3 Enter the following command to install the G.729a codec:
vcx-install IPMSG-UK-EN-G729a-SPEAK-1-1.i386.rpm