I'd like to be able to interract with a piece of hardware which is able to be controlled by a standard phone line (and provide vocal metrics, ...)
Let me stress that it is not a modem, nor has it modem capabilities. I'm playing with plain old DTMF and pre-recorded audio messages.
What I want to achieve is :
- Intercept phone calls triggerd by the device
- Trigger a phone call to the device
And in both case being able to detect/send DTMF and record audio messages on the PI.
It has it's own power source so I suppose it won't need much of the power provided by a normal phone line. Thus I hope it will work with GPIO power...
Do you have any ideas on how to achieve this ?