aptitude install subversion
cd /usr/src
svn co http://svn.digium.com/svn/asterisk/branches/1.4 asterisk-1.4.11svn co http://svn.digium.com/svn/asterisk/branches/1.4 asterisk-1.4.11
svn co http://svn.digium.com/svn/libpri/branches/1.4 libpri-1.4.1

svn co http://svn.digium.com/svn/zaptel/branches/1.4 zaptel-1.4.5.1

svn co http://svn.digium.com/svn/asterisk-addons/branches/1.4 addons-1.4.2


aptitude install linux-source
aptitude install kernel-package
aptitude install g++
aptitude install libncurses5-dev
aptitude install linux-kernel-headers
aptitude install sqlite
aptitude install libnewt-dev
aptitude install libusb-dev
aptitude install zlib1g-dev
aptitude install libmysqlclient-dev
aptitude install libsqlite0-dev

make oldconfig && make prepare && make bzImage && make modules

cd /usr/src/zaptel*
./configure
make menuconfig  <-- this step is not compulsory
make install

cd /usr/src/libpri*
make install

cd /usr/src/asterisk*
./configure
make menuconfig <-- this step is not compulsory
make install

cd /usr/src/addons
./configure
make install

add a line in /etc/modules like below
ztdummy

cd /usr/src
wget  http://mirror.freepbx.org/freepbx-2.3.1.tar.gz

aptitude install apache-ssl
aptitude install php5 php5-cli