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Setting Baud Rates

Faxing over VoIP

VoIP Mechanic recognizes that not every fax machine comes with implicit easy to find instructions for slowing down the BAUD rate to 9600.  Adding to this problem is that most recent fax machines transmit at higher speeds than 9600, so we have started to list some fax model's instructions to lower the transmission speed to a baud rate of 9600.  We recognize that these instructions can be excluded from many of the manufacturers manuals and can also be difficult to locate from any source, even when calling your fax manufacturers support personnel.  So to try to alleviate some of the VoIP frustration in achieving this important setting, we have decided to try to list some instructions to lower the baud rate to 9600 for some fax models.

G711 or Non-Compressed Codec

First make sure that your VoIP connection for you line that you fax on is set to G711. This is a non-compressed codec. G729 uses compression and will make the fax fail. Some providers have a "Bandwidth Saver" setting. This would be a compressed codec. Make sure this is Not enabled. If you do not have access to this setting call your provider and make sure your connection is set for G711.



Why you need to lower the baud rate to 9600.

Faxing over VoIP can present certain challenges which require a slower transmission speed, so that most of the data get to it's destination. Packet loss, jitter, and latency all add up to corrupt a fax transmission over VoIP.  When a fax machine determines that data is lost, it will shut down the transmission, even though with some bits of data lost you would still have a workable document.  By slowing down the transmission speed to 9600, you increase the probability that most of the data will make the trip. 


Lowering the Baud rate on an HP6110

You can set the Baud rate by following these steps:

The following instructions may also apply

*One of our visitors suggested entering 1, which seemed to have a better result.  This would relate to a Medium setting, so if parameter 2 does not work, try 2.

Lowering the Baud rate on an HP4110

You can set the Baud rate by following these steps:

Lowering the Baud Rate of an HP4219

Lowering the Baud rate on

HP6100xi, HP7410xi and HP PSC2210

You can set the Baud rate by following these steps:


Lowering the Baud rate on a HP

Officejet 7300/7400 series all-in-one

Fax Settings for VoIP.  Try VoIP Mechanic's suggestions, I did.

Lowering the Baud rate on a Canon

Fax Phone B95.

You may find that these directions will work with other Canon fax machines or be close enough to find the correct TX and RX Start Speeds.

For More Cannon Fax Machines [Follow]

Lowering the Baud rate on Brother

fax machines.

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. For more information on VoIP Fax settings for Brother fax machines.

Lowering the Baud rate and disabling

ECM on a Brother MFC 420CN

This multifunction Brother machine has a normal Fax BAUD rate of 14400.  Use the following steps to set the machine to a basic setting which will both lower the BAUD rate to 9600 and disable ECM.