The real work-horses are actually Kamailio and Sems, which are quite little know...

		agranig on Sept 5, 2012 \| parent \| context \| favorite \| on: How to run your own open source Skype replacement The real work-horses are actually Kamailio and Sems, which are quite little known but power a LOT of your ISPs' VoIP systems. Provisioning is built on top of Apache/Perl/Catalyst with a MySQL backend. The billing system is in C and Perl, and the Media Relay is in C with an own kernel module on top of iptables. Asterisk is pretty insignificant, but it's surely the best known part in the VoIP world.

Thank for the info.

Have you considered of using Freeswitch to replace Asterisk and maybe even your own media relay module?