I was using vgetty for land-line voicemail a few years ago, and even wrote some PHP to present the messages, and if you select one it would send back an .au file, which the Audrey (3Com Ergo web appliance) could play inside its web browser. So when the iPhone came out, I thought "visual voicemail" looked kindof familiar. :-) But I didn't bother with any voice menus, it was just like an answering machine. The next problem was how to detect "empty" messages (the caller didn't say anything and hung up); it's not quite silent because you hear the "click" when the caller hung up. I was just using recording time to decide, so if a message was too short it would think it was empty; but often it would think an empty message was a real one, because there was a delay of a couple seconds between the "click" and the time that the modem reported that the call was hung up.
vgetty is picky about the type of modem, BTW: it has to be the kind that can digitize the audio and stream it over the ISA bus, or over the serial port. (Otherwise you would need a way to get the analog audio into your sound card's line input, and a way to get the line output back onto the phone line. Most modems don't have line-level inputs/outputs.) A few "smart" modems have AT command extensions which make audio streaming possible. So if the GSM radio cannot stream audio digitally, but can only output an analog signal, then let's hope the Neo has a connection from the analog audio to the line input internally, which would make it possible to record conversations, build "answering machine" applications, use BlueZ to stream SCO audio to a Bluetooth headset, etc. Apparently it would be all about configuring the Wolfson to digitize the audio coming in on RXN/RXP: http://wiki.openmoko.org/wiki/Neo1973_audio_subsystem#Voice_Calls it looks like recording should be possible, because RXN/RXP go both to the output mixer and to the ADCs as long as the switches on the input side of the ADCs are set correctly. Anybody know for sure? The usual low-end Asterisk approach is to use a Winmodem with a certain chip, which is basically a sound card (DSP chip) with a phone-line interface rather than line-in/line-out. (Not the same thing as you need for vgetty.) That means they rely less on hardware (the way vgetty relied on the modem to report incoming calls, the line being on-hook/off-hook, etc.) and more signal-processing is done in software. They also have an Alsa interface already, so that you can use local audio devices on the server (use your soundcard as a speaker phone, or plug in a USB handset or whatever). So if you can configure the Wolfson to act as a 2-way gateway between Alsa-based software and the GSM's analog input and output, then it should be possible to use Asterisk, assuming it's not too stressful for our poor little ARM. :-) Or maybe it will be necessary to fork Asterisk to make something lighter-weight, and more GSM-specific. But I don't have the time to invest in that. (After I started playing with asterisk I gave up on doing voicemail with vgetty, and I'm trying to avoid the need to turn on my 10.5-year-old dual-PII machine which has ISA bus, because it's noisy and takes too much power relative to its computing capacity. :-) _______________________________________________ OpenMoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community