MySQL ◦ AGI ◦ PHP • SipXECS ◦ IP-PBX / Freeswitch, sipXpbx ◦ C++, Java ◦ PostgreSQL • OpenBTS / YateBTS • Vicidial ◦ Call-center / Asterisk ◦ DB: MySQL ◦ PERL, PHP ◦ AGI, FastAGI, AMI • Kazoo ◦ Cloud PBX / Kamailio, Freeswitch ◦ DB: CouchDB ◦ Erlang ◦ mod_erlang ◦ RabbitMQ