About rf 433MHZ ring button:

Step 1. Buy a sonoff RF bridge
Step 2. Install ESPURNA FRIMWARE on it ( http://tinkerman.cat/hacking-sonoff-rf-bridge-433/ )
Step 3. Put Sonoff RF in Learning Mode, push the button on the IPCAM device.
Step .4 Save the learnig code in one of the swtich position

Now you ...