Need extra help installing your Ooma Hub or Telo system? Let us know.
#89559 by tjdmax
Mon Nov 14, 2011 6:11 pm
I just installed OOMA about 6 days ago. I got the bugs worked out and the voice quality is good now. I still can't get my All-in-one Officejet L7680 to send or receive a Fax. I have my OMMA connected to the router and tried to use the HP test fax number dialing *99 before the number with no success. I've lowered the FAX machine to the lowest setting 9600 baud and disabled ECM.
I did a ping test and the Jitter was 9ms on time and 6ms the second time. I know the fax machine works on VOIP because I have not canceled our current phone company which uses Voip also and still can fax when its connect to that service. I had the OOMA phone rep fax me something and it worked but it would not auto answer. I'm hoping that some one has an answer or solution to this problem. :(
#89561 by thunderbird
Mon Nov 14, 2011 6:21 pm
tjdmax wrote:I just installed OOMA about 6 days ago. I got the bugs worked out and the voice quality is good now. I still can't get my All-in-one Officejet L7680 to send or receive a Fax. I have my OMMA connected to the router and tried to use the HP test fax number dialing *99 before the number with no success. I've lowered the FAX machine to the lowest setting 9600 baud and disabled ECM.
I did a ping test and the Jitter was 9ms on time and 6ms the second time. I know the fax machine works on VOIP because I have not canceled our current phone company which uses Voip also and still can fax when its connect to that service. I had the OOMA phone rep fax me something and it worked but it would not auto answer. I'm hoping that some one has an answer or solution to this problem. :(

Fax: what seems to be working now?
Some back ground:
viewtopic.php?f=8&t=12241
By Bobby B » Mon Aug 15, 2011 4:17 pm
“A few weeks ago all Telos received fax tone detection support, which allows the Telo to change to an uncompressed codec when a fax call is detected. As a result of this change, the manual fax mode parameter is no longer needed. We're in the process of updating the documentation to reflect this change”.

Try testing with the HP Fax test number:
I tried the HP Fax Test number 1-888-473-2963 fully expecting it to not to work. (This number works with any Fax machine).
But it worked fine. Within five minutes I received a return Fax from the HP Fax Test number.

Some people had said that after changing their Ooma connections to Modem-Router-Ooma, that their Fax began to work.

I have read where some people after connecting their Fax machine directly to the Ooma device Phone port, with nothing else connected, allows the Fax to work. (But mine goes all the way across the house with other phones connected, without any problems).

Others have said that after making adjustments to the Quality of Service settings in Ooma Setup, their Fax began to work properly. What seems to be working with the current firmware versions is to set Ooma Setup Quality of Service Upstream and Downstream Internet Speed settings to 80 to 90% of the measured Upload and Download speeds as measured by Phonepower Speedtest settings, http://www.phonepower.com/speedtest . After running Phonepower Speedtest, click on the Phonepower Advanced tab. The Speeds are at the top of the page. Multiply .8 or .9 times the Upload and also the Download speed, to obtain the values to be entered in Ooma Setup Advance page. Ooma Setup is accessed by typing http://172.27.35.1 in a computer, connected behind the Ooma Home port, browser window.

Also try dialing the complete number including the 1, example 1-xxx-xxx-xxxx. (Also try dialing the number 1-xxx-xxx-xxxx-# adding the hash mark to speed dialing). Remember that with Ooma, any call in the USA isn't long distance. For some Fax machines you have to add a pause or two after dialing the 1.

Entering a pause to a fax phone number. See http://mikeyates.com/wordpress/?tag=fax-pause .

If you have ten digit dialing enabled in My Ooma, https://my.ooma.com/system, you can dial without using the 1 for long distance numbers.

A DSL filter, installed in the reverse direction, (even if you don't have DSL) in the phone line going from the Ooma device to the Fax phone port, has helped some people, especially with inbound faxes.

Some people have had success without adding any prefix to the number to be faxed since the Ooma Fax change. I’m in that category. Ooma suggests using *99 pause, or pause pause before the number being dialed. *98 and *96 has helped Ooma Telos in the past.

You will want to make these changes to your Fax machine:
Slow down the transmission speed. Set the BAUD rate of the fax machine to 9600 bps or even lower (7200 bps would be the next slower setting).
Turn off or disable ECM (error correction mode), a setting, usually defaulted on, that many fax machines have.
#89602 by tjdmax
Tue Nov 15, 2011 5:26 pm
Still no luck getting the return fax back. It appears that the FAX is sent to HPFAX, but I dont get a return fax. I didn't have to use the *99 and I paused after I dialed the 1. I'm also just faxing a blank piece of paper to the 1-888-473-2963 number. Do you know if it has to have some information on the faxed sheet. I also have my caller ID blocked does that make a difference when use this test fax service?
#89605 by thunderbird
Tue Nov 15, 2011 5:41 pm
tjdmax wrote:Still no luck getting the return fax back. It appears that the FAX is sent to HPFAX, but I dont get a return fax. I didn't have to use the *99 and I paused after I dialed the 1. I'm also just faxing a blank piece of paper to the 1-888-473-2963 number. Do you know if it has to have some information on the faxed sheet. I also have my caller ID blocked does that make a difference when use this test fax service?

I don't know if you have too, I always add my phone number to the fax page being sent to the HP fax test number. Somehow they have to have your number to return the Fax.

Try temporairly turning off the Caller Id Block and test.

Also test with a reversed DSL filter in the phone line to the Fax, even if you are not using DSL.
#89686 by murphy
Thu Nov 17, 2011 1:25 pm
tjdmax wrote:Where would a good place to get a DSL filter? I would like to fix this so I can port my number and cancel my old phone service.

Lowe's has them.

http://www.lowes.com/pd_302995-63374-TP ... 151&rpp=24
#89760 by tjdmax
Fri Nov 18, 2011 3:57 pm
Tried the DSL Filter with no success. This is really strange when my fax machine will work on time warners VOIP phone service but not on OOMA. I was able to send a test fax to the HP number and I started to get a return fax but it failed. Only a portion printed out. I sure hope they can fix this soon. :cry:
#89761 by thunderbird
Fri Nov 18, 2011 4:15 pm
tjdmax wrote:Tried the DSL Filter with no success. This is really strange when my fax machine will work on time warners VOIP phone service but not on OOMA. I was able to send a test fax to the HP number and I started to get a return fax but it failed. Only a portion printed out. I sure hope they can fix this soon. :cry:

Go to and read this site for troubleshooting for your Fax:
http://h20000.www2.hp.com/bizsupport/Te ... x_received

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