Free voicemail greetings
17 kilo hertz
At 1/2/10 04:46 AM, MeAgain said...
id 14255, my other mosquito, has been approved
At 2/17/11 07:42 AM, Spooky said...
300 to 3400 Hz. That's ALL you have to work with on a standard voice telephone line. Your high-pitch tone will hit a low-pass filter at the local telco's central office (switch) and go away.