I just bought the MF726Cdw and the fax is not working on my comcast voip. When I try to send a fax you can hear a dial tone, an unhook, a number dial and then a few fax noises and then it promptly drops the call. If you look in the error logs it shows error message 18. I have tried multiple numbers and also setting the fax data transmission rate settings lower and also setting a 5 second delay. None of this has helped. My old lexmark all in one used the same phone line and the same comcast voip modem and never had any issues sending a fax. I really need to get this working as I have a few forms that I need to send in that the receiver will not accept in any other form than fax.
Thanks!
