Last week at Comdex, I happened across Digicom Systems' booth. They're selling a PC board with a programmable DSP chip from Analog Devices that can be programmed to act as a sound card or as any of several dial modems up to V.32bis. AND... it can be programmed with the GSM vocoder algorithm (approx 13 kb/s). The price was reasonable, too...in the $100 range, as I recall. This could be the enabling product for a homebrew secure telephone. The board can't act as a vocoder and modem simultaneously, so you'll need either two boards, or one board plus a conventional modem. But a vocoder that operates within dialup modem rates has been the roadblock so far in a secure telephone. Anyone interested? The address on Digicom Systems' flyer is 188 Topaz St, Milpitas CA 95035. Voice: 800-833-8900. Fax 408-262-1390. Naturally, I have no connection with this company other than as a prospective customer. --Phil