The integration of the VoIP system into Outlook will allow you receiving electronic messages on missed calls, call transfers etc. By click of a mouse on the number you can also call the addressee from whom you missed the call.
Call center - is a center where the company's incoming and outgoing calls are taken care of, it can be a centralized office, used for receiving and forwarding high volumes of information, incoming by the way of phone calls. There are two types of call centers internal call center and outsourced call center.