VoIP is short for "Voice Over Internet Protocol" .
VOIP numbers have two identifiers: caller ID and the CNAM. Caller ID is the number you see on your phone when a call comes in and it is very easy to fake. CNAM however, is very difficult to tamper with, so many spoofers don’t even bother with trying to alter it. Also, there are CNAM registries and databases available for professional queries. This makes tracing a CNAM a feasible option if you have the time, tech skills, and energy for it.
You can read about finding the owner of a VOIP phone number and view the video below to learn more: