PopUp a PhoneCall Form on new phonecall created

Hi,

I am working on a custom application for CRM 2013 Dynamics. The most important task would be to pop-up a new PhoneCall task when that's created (by the external service). I think the best way would be to trigger the PhoneCall Entity's Created event from a process, but I can't pop-up a form from here. Could you suggest me some possible way to achieve it? 

Any help would be appreciated.

IK