Akuvox R20 Series - 2.4.3. Push Button Action

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1.3.2. Receiving a Call
User can use IP phone or indoor monitor to call R20 series and R20 series will answer it automatically by default. If user disable auto
answer, pressing button to answer incoming call.
1.3.3. Unlock by RF Card
Place the predefined RF card on the card sensor area. The door phone will announce ‘the door is now opened’ and open the door
13.56MHz and 125KHz RF card is supported by R20 series.