启用呼叫转移功能下，允许通过手机APP实现视频通话、远程开锁，
其他功能：监视门口机、和门口机主动通话、主动开锁，监视IPC
设备连接外部英特网并SIP账号注册成功下，转呼适用于：
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启用了呼叫转移模式用户分机
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What it can do:
Answer call from outdoor station by mobile phone, talk and unlock;
Monitor door station and IP camera
Operate electric locks
Applicable Premise:
The system has been connected to the external Internet and the SIP account has been registered successfully:
User monitor or guard unit in call divert mode
Virtual users registered in door statioin
APP download: Search '‘VDP Connect’' in Googleplay market or IOS store
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Smartphone operating system: Android 9 or above, IOS 13 or above
Video introduction of APP operation(with IP monitor)
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