[Asterisk-Users] Play tone till first digit read

[Trevor Peirce]

Ed Greenberg wrote:

> What I need is to prompt, not with a recording, but by playing a tone 
> that will terminate at the receipt of the first digit, sort of like 
> dial tone. In fact, it could BE dial tone.

Why not just use a recording of your prompt tone and let Read do it for 
you?  It will stop when the first digit has been dialed.  Just set the 
timeout to something very short and make the recording as long as you 
want to wait.