I'm trying to get my internal conexant fax modem to work with my digital phone service with vonage. Every time I try to fax, the fax program says the call is busy which is not the case - I manually dialed the phone # to test. Vonage says to lower a fax modem to 9600 baud. I did this. It also says to turn OFF ECM. How do i do this with a faxmodem?