Wanted to display IMEI number of CPE device in device list page

I wanted to display the IMEI number of CPE device while it joins the server.
How does we can achieve it, can you point some code references.

I understand that Device.Cellular.Interface.{i}.IMEI parameter, actually i need the code place (GenieACS file )where we parsing the Data reported by Devices.

Create a virtual parameter that figures out the IMEI, then use that vparam on the index page.

I have used Admin->Config-> where i have edited the index parameter and displayed using Device datamodel
thanks a lot