Welcome to the RingCentral Community

VOIP = Voice over IP, digital lines, internet phones -- Ring Central is VOIP, cellphones are VOIP

POTS = Plain Old Telephone Service -- traditional landlines; uses copper pairs

As the Ring Central documentation carefully explains, Faxing over VOIP has issues and customers with intensive fax requirements should stick with a POTS line.

Our company's reliance on faxing has diminished considerably so we are taking the plunge and going all-VOIP.

Here is an expectation table I derived from my testing of our small (<10) user Ring Central system that some may find useful:

To: RC fax # (VOIP) POTS fax number

From

POTS fax machine works fine traditional faxing not relevant to RC

RC # autodetects

fax call and processes

per settings

VOIP fax machine        may not work        works fine
                        especially if 
                        on same RC account