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NOTE: If programming into an existing network, ensure that the OTIUEX is programmed to the Active unit. 2 Features & Operation Answering Calls (Regular Mode) When visitor presses the Call button on intercom, the telephone connected to the OTIUEX will ring distinctively up to four times. If an expandable OTIUEX system is used all phones within the system will ring. When the phone is answered it will connect to the Intercom at gate or door. After connecting to the Intercom, the gate can be activat