To run the on-premise software, you need the following:
The software works with almost all online VOIP services, SIP trunk services, and many PBX systems
You can set up the computer:
The steps below use CallCentric as the phone service. Setting up other services is similar and the details can be found in the Set Up Various Phone Services section.
The software is capable of running a few hundred, even thousands of concurrent calls. When scaling up the system, more computing resources and internet bandwidth are needed. In addition, your phone service must be able to handle the same number of (or more) concurrent calls.