“How do I set up the Epson - WorkForce Pro WF-4630 printer to fax over VoIP (voice over Internet Protocol) & is there any additional equipment needed?”
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First some background on faxing and VoIP. Faxing has been around for years and most of the protocols were written with the intent of sending those signals over traditional phone circuits using sounds. Those sounds were turned back into data by the receiving fax machine, which expects a constant, steady transmission of data, without any loss. If there is some loss of data the receiving fax machine will shut down the transmission. The problem is that the codecs used by VoIP IADs are designed to compress voice, not the analog signals sent and received by modems. In a VoIP Internet world, voice is first converted into packets and then they are sent over the connections that make up our our vast Internet. They may take slightly different times to arrive at their destination. In doing so some packets may be discarded, but the end result is that the receiving VoIP device has enough packets to make a clear and understandable conversation. I suggest slowing the transmission rate down and allowing the machine to continue receiving the transmission even though a few bits of data were lost, then faxing over VoIP can become more consistent. This suggestion in many cases can resolve issues that prevent faxing over a VoIP connection, but not in all cases. This data came from this site, you should check it out. http://www.voipmechanic.com/faxingissuesandotherdevices.htm
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