https://www.ringcentral.com/gb/en/support/capacity.html
Test Your Connection's Call Capacity | RingCentral UK
Take this test to find out how many simultaneous RingCentral calls your office broadband connection is capable of supporting.
test your connectionringcentral ukcallcapacity
https://help.webex.com/article/n2g8glg
Webex App | Test Your Connection with the Health Checker
Webex App | Test Your Connection with the Health Checker
test your connectionwebexapphealthchecker