Dahua Technology DHI-VTO4202F-P-S2 2MP IP Outdoor Video Intercom - Manual (Page 39)

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Add room numbers
1) Click Add.
Add a single room number
2) Configure the information on the left. See Table 5-2 for details.
3) Click Save.

Adding multiple room numbers.
Add room numbers in batches
1) Configure the information.
 Unit Layer Amount: The number of floors in the apartment.
 Room Amount in One Layer: The number of rooms on one floor.
 First Floor Number: The first room number on the first floor.
 Second Floor Number: The first room number on the second floor.