The rule of thumb is that each phone can take up to 0.1 MB/s bandwidth, so if you have 10 phones, all on a call at once, it would take up to 1 MB of bandwidth, plus you have to consider all the other internet traffic being used; for this reason, it’s hard to get a hard number that applies to everyone, it all depends on how many phones, and how much internet traffic is in use.
Ways to detect if you have poor internet speeds:
If it's possible, plug the computer you are using to run the test directly into your network through an ethernet drop. A direct internet connection yields the most accurate test results; wifi is always slower.
Ping is affected by things like distance, quality of service, type of connection, etc. Ping tests check the time it takes to send a message from one IP address to another. The smaller this time value is (usually in ms), the better. A good ping test is 5- 30ms, anything higher causes issues on anything web-related (phone calls, internet service).
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