Hikvision + Spectrum + Audio

I have a customer who wants to add audio to their building. We have worked out the legal side of how to do this with the lawyers and just need to figure out how to do it...

We're currently using DS-2CD2142FWD-IS and trying to figure out a way to wire a mic into the camera and looking for some advice on what we should use for a mic. The camera will be located in a small vestibule (man-trap) where visitors will be signing in before they can enter the facility.

We're using Spectrum as the VMS.

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