MSCRM Standard Appointment Action CRM 2016 Mobility

Hi!

I have an issue with the Appointement ribbon  button on Activity , the action behind runs a javascript function that opens a pop up to meet there business requirement .

Now ower client wants to use native smarphone application , but the pop up is not suported so i suggested to him , to call the standrad action in case of Mobile Application , instead of openning a Pop Up . 

So, i need the MSCRM function name that call the Appointement Form,

 I used Xrm.Utility.open("appointement") , but o got a issue while saving  the appoitement : the calender does not refresh , so i want to call a standard action that can open appoitement create form and refresh the calender  befor saving the form .

I'm using CRM 2016