Pass Parameter from one from to another form in MSCRM 2016

On click of button using Custom Ribbon call the below function to pass the parameter from current from to Lead form

function ConvertToLead()
{
//Get Values from Phone Call
var subject = Xrm.Page.getAttribute("subject").getValue();
var phone = Xrm.Page.getAttribute("phonenumber").getValue();
var to = Xrm.Page.getAttribute("to").getValue()[0].name;

//Set Values to lead

 var parameters = {};
parameters["subject"] = subject;
parameters["mobilephone"] = phone;
parameters["lastname"] = to;

var   windowOptions = { openInNewWindow: true };
Xrm.Utility.openEntityForm( "lead" , null , parameters ,windowOptions);
}