Switching to VoIP

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Compiling and Installing Asterisk

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53

Installing Mpg123

The application responsible for providing music and messages for holding callers is

called Mpg123, but don’t confuse it with the Mpg321 application that ships with

Red Hat Linux. Mpg321 doesn’t work with Asterisk, so you must replace it with

Mpg123.

To do this, start by shutting down the Asterisk server process if it’s running. Then,

make sure there are no Mpg321 or Mpg123 processes running:

# ps ax | grep mpg123

900 std S+ 0:00.00 mpg123

# kill 900

# ps ax | grep mpg321

1024 std S+ 0:00.00 mpg321

# kill 1024

You may not actually have both applications running, or even installed, but it’s best

to make sure neither is running before you proceed.

As of this writing, Mpg123 has a remotely exploitable security bug

that is documented at http://www.mpg123.de. Be sure to read the

developers’ description of the issue and proceed with caution.

By default, Red Hat has symbolic links for the Mpg321 package that make it appear

synonymously with Mpg123. These must be removed in order to install the correct

package:

# rm /usr/bin/mpg123

# rm /usr/local/bin/mpg123

Next, download a Red Hat Linux–compatible build (RPM package) of Mpg123 from

http://www.mpg123.de and install it with a command similar to this one, called from

the directory where the downloaded ...