I've had good success in the past sending faxes over VoIP, primarily with two prior providers, but now it seems to be impossible. Virtually every fax that I try to send results in a "The remote fax machine did not respond in time" or "The fax can't be sent because of an unexpected error." I've tried reducing the port speed of my modem to 9600 and even slower. I have used the Grandstream HT502 device provided by Voipo as well as my own Innomedia device which worked wonderfully with other VoIP services (my last VoIP provider did not welcome BYOD). The Innomedia has a T.38 fax setting, and I understand that the HT502 does as well. Any thoughts on how I can get fax service to work over VoIP. Yes, I know that I can use the outbound fax service, but it's a number of extra steps save the file, to log in to the Voipo account, and to set up the fax for sending.

Thanks.