oFono.org is a place to bring developers together around designing an infrastructure for building mobile telephony (GSM/UMTS) applications. oFono is licensed under GPLv2, and it includes a high-level D-Bus API for use by telephony applications of any license. oFono also includes a low-level plug-in API for integrating with open source as well as third party telephony stacks, cellular modems and storage back-ends. oFono Architecture