Can you advise where you can buy equipment and software for a call center?

The Voiptime Cloud company has been operating for more than ten years from which you can purchase call center equipment and software. We have been using their service for over a year now. I like everything, there are a lot of possibilities. We planned to work only with the incoming line, but as an experiment we started cold calling - and we get excellent results. The manager prompted everything, helped with the settings.