Projects
From Wiki
There are a number of open source - open hardware project that currently are working on VoIP solutions for the developing world. These are a few of them:
The Free Telephony Project is an initiative lead by David Rowe with the goal of providing free (as in speech) reference designs for embedded telephony. Both the hardware and software are open. You are free to copy, modify and re-use the hardware designs. The hardware for a complete embedded Asterisk IP PBX (including multiple analog ports or a T1/E1) can be built for a few hundred dollars. No PC required!
There are some very good social reasons for developing open telephony hardware. This project can help bring low cost telephony to the developing world.
The project is being developed around the Blackfin processor - a powerful, low cost DSP/RISC processor that can perform DSP processing and run uClinux. It is approximately 10 times as powerful as a WRT54G or wrap board when used for Asterisk. This means high quality echo cancellation and codecs are possible on a low cost embedded system. Best of all, an open source hardware/software community exists around the Blackfin.

