This Python-script integrates the old rotary dial and handset on the AS Elektrisk Bureau pulse phone to use SIP.
It uses GPIO on Raspberry Pi to communicate with the rotary dial, and the onboard soundcard for ringtone. An USB-soundcard is used for mic and handset audio.
Some configuration on the Raspberry Pi is needed to make everything work, including installing the dependencies and configuring PulseAudio and ALSA to enable software mixing of sounds.
Linphone (linphonec for console) is also required because it handles the SIP-connection.
There is some code to use Pjsip, but it's not finished.
For more information on the build, see http://imgur.com/a/HECDL/.
git clone https://gitlab.linphone.org/BC/public/liblinphone.git
cd liblinphone
cmake .