I need some advice about a device that I am building. It is a personal emergency wearable response device that has a button, when pressed an alert signal is sent to a Linux box/base station that is supposed to dial an emergency call center over the landline. The linux box has the speakers + mic that should act as the handset.
I have researched using a standard voice modem and the consensus seems that this would not work. The constraints that I have for this solution include: 1- I can extend the hardware on the base station but nothing too expensive 2- I can have on the backend/call center a more expensive setup.
An early idea that I was contemplating using a modem to do a PPP connection then initiate a phone call. The challenge here is the delay in setting up the connection.
Any suggestions if Asterisk might work would be great particularly with a voice modem, I have little experience in this area. Any recommendations in terms of hardware would also be very helpful.