Computer interactive system and services in Classic offer several facilities such as interactive voice response (IVR), CRM software, computer telephony integration (CTI), enterprise messaging, fax server, call accounting, and software assurance, to name a few. Quality, brand name and reliability are some of the factors that influence the selection of these services by the clients. These services are offered across a numbers of sectors. The companies that offer computer interactive systems and service update the hardware as well as software on a regular basis. The services can be availed on a contract basis or can be acquired following a one-time payment.