Fax from VOIP (digital) vs POTS (analog) expectation table

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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




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F. X. Flinn

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Posted 2 months ago

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Michel, Champion

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We have experienced the same issues in many different setups, not just RC.  The most problematic issue being physical fax machine -> anolog-to-VOIP-convertor -> VOIP-fax  (ie. voip to voip fax)   Lots of these type of connections seem to answer, but not acknowledge properly, so the results is the first 1 or 1.5 pages go through and then the receiving VOIP fax line disconnects.
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F. X. Flinn

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I was tempted to add to the VOIP to VOIP box "why are you doing this in the first place, just email a PDF" but decided not to because some may be using a fax machine without realizing it is tied to a analog to digital converter like the Cisco ATAs Ring Central sells. 
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Michel, Champion

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exactly correct - we have several small offices that need to quickly sign a form and have reception fax it off - this is much quicker workflow to just use a physical fax machine with an ATA.