R28 Door Phone Administrator Guide
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Broadcast Interval: select the time interval between every two open door tones. For
example, if you select 2, then the interval between two open door tones will be two
seconds. The number of open door tones should be 2 minimum if in this application.
Parameter Set-up:
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Open Door Failed Warning: upload the hear the open door failuretone.
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Ringback: upload the ringback tone.