Premise-based Call Centre Technology: Historically, call centres have been built on PBX equipment that is owned and hosted by the call centre operator. The PBX might provide functions such as Automatic Call Distribution, Interactive Voice Response and Skills Based Routing.

Virtual Call Centre Technology: With the advent of the Software as a service technology delivery model, the virtual call centre has emerged. In a virtual call centre model, the call centres operator does not own, operate or host the equipment that the call centre runs on. Instead, they subscribe to a service for a monthly or annual fee with a service provider that hosts the call centre telephony equipment in their own data centre.

Cloud Computing for Call Centres: Cloud computing for call centres extends cloud computing to Software as a service, or hosted, on-demand call centres by providing application programming interfaces (APIs) on the call centre cloud computing platform that allow call centre functionality to be integrated with cloud based Customer relationship management, such as Salesforce.com or Oracle CRM and leads management and other applications.