Fax Software

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If he is using VoIP to send/receive faxes, then he will have intermittent results of receiving or sending faxes with WinFax. I suggest ensuring that his Vonage account is adjusted properly for faxing service (Vonage can adjust bandwidth for fax). Its possible something was changed (hardware, account settings etc) 6 months ago to cause this problem. The other issue could be compatibility between the two fax modem devices, which could be difficult to troubleshoot. You would need to determine what type of fax modem they are using. If your hardware has been checked, don’t get complaints from other physicans, and you are using regular phone lines (not VoIP) then it is unlikely the problem is on your side.