Submitted by geo on Wed, 01/30/2008 - 22:47.
Vonage and other VoIP providers in the U.S. support the ability to add fax services or use your existing fax machine with a VoIP box.
When coupled with a Junxion box, the primary limiting factor of VoIP faxing becomes the upload speed. Vonage recommends having at least a 90k upload speed to make a successful connection. When using a cellular modem card, the upload speed can be significantly less than a high-speed land connection.
Usually, receiving faxes with a cellular modem card is not a problem, but (because of the upload speed) sending faxes can be.