I have a Cannon MX860 all in one machine. I have tried sending a fax multiple times with different baud rates down to 7200. The other machine answers and the two begin negotiation and the speaker goes quiet. It appears to be sending the fax, but then gets an error report with "incomplete transmission". No error number is reported just "ng". I am attempting this through a MagicJack phone connection.

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Faxing over VoIP - Sfax

Check the baud rate of your transmissions. Slow them down to the slowest setting and send a test fax to a helpful person. Slowly increase the baud rate (communication data speed) and send the fax test. When the fax doesn't show up on the receive site, then step one baud rate speed back, and save the setting.

It could also be your fax that is faulty, or even the receive sites fax, also being faulty.

To test your copy-head, insert a document into your loading section of the fax and press copy. If the copy prints out fine, then you know the head is reading correctly.

It is also possible that the receiver fax (the other end) has a printhead failure.

Lowering the Baud rate on Brother fax machines.

• Press the Menu or Menu/Set key. Then Fax, Miscellaneous and Compatibility.
• Press the Up or Down key until you can select Basic. Basic reduces the modem speed to 9600 bps.
• Press OK or Menu/Set or Set key.
• Press Stop/Exit.

Note these instructions should work for the following models: Fax-1835C, Fax-1840C, Fax-1940CN, Fax-2440C, Fax-2820, Fax-2825, Fax-2920, MFC-210C, MFC-215C, MFC-240C, MFC-3240C, MFC-3340c, and most other MFC models.

http://www.voipmechanic.com/voip-fax-settings-9600-baud.htm

The baud rate is automatically set by the machine when it connects to the remote machine. The machines start at the highest speed and drop down until both machines can send/receive without any errors then they send the pages. You can not manually set the speed.

Buddymc

To set the receive speed
Change RX Start Speed Setting The message [START AGAIN] will appear if phone line conditions are less than perfect. Decrease the transmission (RX or send) speed if this message appears frequently on the LCD.

1. On the operator panel, press <Menu>.
   
   
2. Press the left '<' or right '>' arrow repeatedly until [USER DATA] appears.
   
   
3. Press [Set].
   
   
4. Press the right arrow repeatedly until [FAX SETTINGS] appears.
   
   
5. Press [Set].
   
   
6. Press the right arrow repeatedly until [RX SETTINGS] appears.
   
   
7. Press [Set].
   
   
8. Press the right arrow repeatedly until [RX START SPEED] appears.
   
   
9. Press [Set].
   
   
10. 1. The factory default RX (send) Speed is 33600 bps.
       
    2. You can select from the following RX Speeds:
       14400 bps
       9600 bps
       7200 bps
       4800 bps
       2400 bps
       
       
11. Press the right arrow to display the applicable RX Speed.
    
    
12. Press <Set>.
    
    
13. Press <Stop> to return to standby mode.

To Set the Send Speed

Change TX Start Speed Setting The message [START AGAIN] will appear if phone line conditions are less than perfect. Decrease the transmission (TX or send) speed if this message appears frequently on the LCD.

1. On the operator panel, press <Menu>.
   
   
2. Press the left '<' or right '>' arrow repeatedly until [USER DATA] appears.
   
   
3. Press [Set].
   
   
4. Press the right arrow repeatedly until [FAX SETTINGS] appears.
   
   
5. Press [Set].
   
   
6. Press the right arrow repeatedly until [TX SETTINGS] appears.
   
   
7. Press [Set].
   
   
8. Press the right arrow repeatedly until [TX START SPEED] appears.
   
   
9. Press [Set].
   
   
10. 1. The factory default TX (send) Speed is 33600 bps.
       
    2. You can select from the following TX Speeds:
       14400 bps
       9600 bps
       7200 bps
       4800 bps
       2400 bps
       
       
11. Press the right arrow to display the applicable TX Speed.
    

You can download a copy of the user manual for the F80 at
http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=DownloadDetailTabAct&fcategoryid=334&modelid=7175

Please make sure to rate this solution. Thanks.

1. Press <Set>.
   
   
2. Press <Stop> to return to standby mode.

That won't make any difference. ALL fax machines are ANALOG and won't work on a DIGITAL phone lines reliably

Try calling that number from a regular phone and listen for fax tones...it may not be a fax number.

older fax machines used a 9600bps baud rate, meaning a transfer rate of 9600 bits per second. a Bit being an 7th/8th of a byte. The newer machines can transfer at 14400bps, which older machines can not read, as its too fast. thats why they asking the BAUD rate.

fax machines are ANALOG devices and will not work reliably on a DIGITAL phone line.

Try the following with the machine in standby mode. (no document fed)
Press MENU/EXIT key ONCE.
Press RESOLUTION key TWICE.
LCD display should indicate "Technical Prg."
Press DOWN ARROW key ONCE
LCD -display should indicate "2 Setup"
Press RIGHT ARROW key ONCE
LCD display should indicate "Setup"
Press the DOWN ARROW key TWELVE times.
LCD display should indicate "13>H/Modem Rate"
Press the RIGHT ARROW key ONCE.
*** NOTE WHAT IT IS ALREADY & DO NOT FORGET IT IN CASE YOU WANT TO UNDO ***
Press the DOWN ARROW key repeatedly to change the setting to 4.8, 9.6, 14.4, 28.8 or 33.6K.
For "9400" set it to "9.6" (9.6K = 9600 Baud)

Also note that for this to fix your problems I would expect to find your machine is currently set to 14.4 or higher.
Change it and see how it works for you. If it is no good, you can always change it back to the original setting.