The Security answering device or the Intercom. 

This is a very secure way of obtaining identification of a person before nearing the point of entry. 

Can be linked with a CCTV camera in order to obtain video footage of a visitor or intruder, as well as the more common voice intercommunication device. 

These security answering devices can be used in conjunction with automatic gates also.

Multi point units for apartment complexes complete with door release or magnetic door locks.     Incorporating camera for visual identification.

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