sources : http://www.senetel.fr/actualites/97-installation-d-asterisk-11-sur-debian-7-wheezy
http://denisrosenkranz.com/tuto-installer-et-configurer-asterisk-sous-debian-6-et-ubuntu/
http://artisan.karma-lab.net/comment-mettre-place-sa-telephonie-grace-a-asterisk

Debian 7

aptitude install build-essential linux-headers-$(uname -r) libxml2-dev libncurses5-dev libgtk2.0-dev libnewt0.52 libnewt-dev libssl-dev

cd /usr/src

wget http://downloads.asterisk.org/pub/telephony/asterisk/asterisk-11-current.tar.gz

tar xvzf asterisk*

cd /usr/src/asterisk*

./configure

make menuselect