Press the call button to call out the predefined SIP number or
IP address .Video call is only for E21V.
During the talk,called party can press predefined DTMF code
number to open the door.
Auto Answer: E21A/V support auto answer by default. Incoming
calls from door device (IP phone or indoor monitor) will be
answered automatically.
2.3. Unlock by DTMF Codes
Users can press the predefined DTMF code from an answer unit to
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