How to Install Asterisk server with yum

Hi Friends, can any one tell me,
how to install asterisk server with yum install.

G-O-O-G-L-E yields asterisk.org/downloads/yum

execute the following at the Linux command line:
(be sure that your system has been updated to use the Asterisk and Digium repositories in addition to the base CentOS repositories.)

see the for more info
http://www.asterisk.org/downloads/yum