Can I communicate between Hikvision intercom monitors?

Yes.

In an Intercom system with 2 or more indoor stations, each station can dial or call between each other by using the following dialing format.

0- (Main indoor unit is typically 0 and other extension units are 1 thru 5)
For Example:

To call the Main indoor station from any indoor station you would dial 0-0

To call the first indoor extension from any indoor station, included the main indoor station, you would dial 0-1

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