Analysis of O.I. of Nifty Options

Hi all ,

While looking at the data of Nifty options, what I'v been observing is, 5900 CE has highest O.I. and O.I. is increasing with decrease in volatility. Does it mena, this Call is getting written on every fall? While 5800 PE and 5700 PE have almost same O.I.. Will they act as a support? Experts please comment.

Thanks and Regards,
Mandar Datye.