Why don't you have a look at the dial application, specifically these options:

'L(x[:y][:z])' -- Limit the call to 'x' ms warning when 'y' ms are left
repeated every 'z' ms) Only 'x' is required, 'y' and 'z' are optional.
             The following special variables are optional:
             * LIMIT_PLAYAUDIO_CALLER    yes|no (default yes)
                                         Play sounds to the caller.
             * LIMIT_PLAYAUDIO_CALLEE    yes|no
                                         Play sounds to the callee.
             * LIMIT_TIMEOUT_FILE        File to play when time is up.
             * LIMIT_CONNECT_FILE        File to play when call begins.
* LIMIT_WARNING_FILE File to play as warning if 'y' is defined. 'timeleft' is a special sound macro to auto-say the time
                        left and is the default.

To play prerecorded tones?

--
Cheers,

Matt Riddell
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