door intercom system for the RaspberryPi in C#
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Use a Raspberry Pi as a VoIP door intercom system.

I use it with my FritzBox to alert all my DECT Phones. Tested on a Pi 2B+ and a Pi Zero with raspbian (and mono).


Makes use of Asterisk and raspberry sharp. Now why would anyone use C# for his door bell? Because I didn't know C# and wanted to practise 😜

C# - Handle the Door

  1. Adjust the hardcoded stuff in Asterisk.cs to match you config 😅
  2. Make all the DLLs and the EXE
cd Raspberry.IO/
mcs -t:library *.cs -r:System -out:Raspberry.IO.dll

cd Raspberry.IO.Interop/
mcs -t:library *.cs */*.cs -r:System -out:Raspberry.IO.Interop.dll

cd Raspberry.System/
mcs -t:library *.cs */*.cs -r:System -out:Raspberry.System.dll

cd Raspberry.IO.GeneralPurpose/
mcs -t:library *.cs */*.cs -r:System,System.Configuration,Raspberry.IO.Interop,Raspberry.IO,Raspberry.System -lib:../Raspberry.IO.Interop/,../Raspberry.IO/,../Raspberry.System/ -out:Raspberry.IO.GeneralPurpose.dll

mcs /t:exe Main.cs Asterisk.cs Notifier.cs /r:System,Raspberry.IO.GeneralPurpose,Raspberry.IO.Interop,Raspberry.System,Raspberry.IO
  1. Throw everything on the Pi.
  2. There install mono:
sudo apt-get install libmono-corlib4.5-cil, libmono-i18n-west4.0-cil, libmono-i18n4.0-cil, libmono-security4.0-cil, libmono-system-configuration4.0-cil, libmono-system-security4.0-cil, libmono-system-xml4.0-cil, libmono-system4.0-cil, mono-4.0-gac, mono-gac, mono-runtime, mono-runtime-common, mono-runtime-sgen
  1. Execute it (best at each startup)
# Provides:             door
# Required-Start:       $start
# Required-Stop:        $shutdown
# Default-Start:        2 3 4 5
# Default-Stop:
# Short-Description:    Doorberry project

mono /etc/door/Main.exe > /etc/door/tuer.log &

exit 0

The Programm will try to connect to a Asterisk manager. It will use it to signal the Door and will wait for a DTMF (button "5") in order to open the Door.

Asterisk - Handle VoIP

Last time I checked it ran with: Asterisk 11.13.1

  1. Change username and password for your VoIP registrar in sip.conf
  2. Change username and password for your manager in username.conf
  3. Remember the hardcoded stuff in Asterisk.cs 😅
  4. Turn off oss and use alsa in modules.conf
  5. Adjust alsa.conf to match your (sound) setup
  6. Turn on manager for localhost in manager.conf

More Scripting

If you want to use a script (additionaly to VoIP) to open the door use Port 14000:

echo -n "AUF" | nc -q 1 localhost 14000

Also clients connected to port 11000 will receive a newline when the bell is detected.



Door Bell, Buzzer and Voice is handled by a little Hat I made for the Pi. Please find it here.

USB Soundcard

The Pi does not have a microphone on its own.