Free Call Center VoiP Softphone for MacOS, Windows, Android and iOS
https://call.center/
We made call.center™ available for multiple operating system platforms including iOS, Android and Windows, allowing you to standardize on this app wherever you go.
Call centre - Wikipedia
https://en.wikipedia.org/wiki/Call_centre
A call centre (Commonwealth spelling) or call center (American spelling; see spelling differences) is a centralised office used for receiving or transmitting a large volume of enquiries by telephone. An inbound call centre is operated by a company to administer incoming product or service support or...
Working in a Call Center: Everything You Need to Know
https://blog.hubspot.com/service/working-call-center
A call center is an office that fields incoming and outgoing customer phone calls. They're operated by phone representatives who manage each call and keep track of open cases and transactions.