Akuvox R20 Series - Input

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2.4. Call Setting
Go to Intercom->Basic, to configure basic call setting.
2.4.1. No Answer Call
Enable it, if there is no answer from push button number over
60s (default value), R20 series will call predefined 'No Answer
Call' number.
2.4.2. Push Button
Push Button: To configure the destination number or IP you
want to contact with. If you would like to call multiple numbers
at the same time, divide them by semicolon.
No Answer Call 1&2: To setup one or two no answer call number.