aptitude install libusrp-dev libosip2-dev libortp-dev git-core gcc build-essential asterisk

The following configuration auto-registers all requested sip extensions and dumps all calls to a conference(meetme)… NOT E911 SAFE!

add to [general] in /etc/asterisk/sip.conf: bindport=5060 srvlookup=yes autocreatepeer=yes canreinvite=no call-limit=1 type=friend allow=gsm context=sip-internal host=127.0.0.1

create context [sip-internal] in /etc/asterisk/extensions.conf: [sip-internal] exten => _.,1,MeetMe(101)

under [rooms] in /etc/asterisk/meetme.conf add: conf => 101

restart asterisk: /etc/init.d/asterisk restart

git clone git://openbts.git.sourceforge.net/gitroot/openbts/openbts cd openbts/public-trunk ./configure make cd apps/ cp OpenBTS.config.example OpenBTS.config nano OpenBTS.config ## make changes? ./OpenBTS

Now search for the network on your trusty gsm device