One of the hardest things still, for me is to calculate what number of Simultaneous calls i need for a new project. Although the rule of thumb (number of extensions decided by 2, or number of extensions decided by 4 often works, it does not always) especially when clients have very specific requirements. I would say it should be useful if you could have tool (webbased) or other that could rather help you with the calculation of the needed number of SC. or at least a web page clearly stating what each event usus in costs of simultaneous calls. I was unable to find a clear enough document on it. - internal calls - external calls - conference - ringgroups - queues - direct assistants - Transfer between IVR Blocks and there might be more specific situations with unusual SC counts, such as a web meeting or webrtc?