the project is : Modifying or developing a voip client, it has to act as a door opener, when other party pushes the # or * key, the raspberry pi has to pull up a GPIO pin for 500 ms to activate the door opener relay.
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Hello. I can configure asterisk that way it will execute "echo 1 > /sys/class/gpio/gpio<gpio num>/value; sleep 0.5; echo 0 > /sys/class/gpio/gpio<gpio num>/value" command on raspberry pi on the * or # key.
Hi, I have experience with Raspberry Pi. I've been working on it for about 3-4 years. If you tell the requirements of the project. We can make it any way you want.