Good day.
We did not understand your question a bit.
WCS works under Linux x86_64 operating system: to install WebCallServer you need a Linux x86_64 server (server side).
If you are already installing WCS on the server, use the root account or privilege escalation using sudo.
For iOS you must build examples according to this
manual in Xcode 10 (client side) or to develop web applications for streaming video and calls, use
Web SDK.
Please tell us more about your case.