svn checkout http://svn.digium.com/svn/asterisk/branches/1.2 asterisk-1.2
svn checkout http://svn.digium.com/svn/zaptel/branches/1.2 zaptel-1.2
svn checkout http://svn.digium.com/svn/libpri/branches/1.2 libpri-1.2
svn checkout http://svn.digium.com/svn/asterisk-addons/branches/1.2 asterisk-addons-1.2

cd zaptel-1.2 && make clean install && \
cd ../libpri-1.2 && make clean install && \
cd ../asterisk-1.2 && make clean install