Sip Express Router over CeNtOS

Install Centos Operating System in your Computer.
Update system using YUM command:> yum -y update
Reference commands:
yum search
yum install

Requirements:

- gcc or icc : gcc >= 2.9x; 3.[12] recommended (it will work with older version
but it might require some options tweaking for best performance)
- bison or yacc (Berkley yacc)
- flex
- GNU make (on Linux this is the standard "make", on *BSD and Solaris is
called "gmake") version >= 3.79.
- sed and tr (used in the makefiles)
- GNU tar ("gtar" on Solaris) and gzip if you want "make tar" to work
- GNU install, BSD install or Solaris install if you want "make
install", "make bin", "make sunpkg" to work
- libmysqlclient & libz (zlib) if you want mysql support (the mysql module)
- libexpat if you want the jabber gateway support (the jabber module)
- libxml2 if you want to compile the cpl-c (CPL support) or pa (presence)
modules
- libradiusclient-ng (> 5.0) if you need radius support (the auth_radius,
group_radius, uri_radius and avp_radius modules)
- libpq if you need postgres support (the postgres module)
- ethereal for debugging

Thats it register your windows messenger and call each other.