Voice Mail Systems

Plain Old Telephone Service

See Also

• http://interstice.com/drewes/answer/ Notes on the Telephone-To-Sound-Card Interface Project
• http://www.automated.it/asterisk/ a very automatic and not massive CD image for Asterisk

GSM Audio

Modems (some are Voice Modems)

DTMF Dual-tone-multi-frequency aka Touch Tones

Speech