Is it possible to add audio recording to all my cameras?

Hello,

I am using the Hikvision NVR - DS-7732NI-I4-16P along with Hikvision Cameras DS-2CD2142FWD-I . I have a few cameras all running on POE. I was wondering if it can be possible to add a microphone to these cameras and also record audio directly along with video to the NVR? Or since there is only 1 audio port, I can only run a single microphone for one cam? What is an alternative or way out?


Thanks in advance!