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#80499 by daet
Fri Apr 29, 2011 1:05 pm
We've used a Ooma Hub for over 2 years, and a Telo for about 18 months to send/receive faxes that range in size from 1-10 pages. Generally speaking we have no problem sending or receiving.

I had posted details of our setup a long time ago; because there have been several new posts expressing difficulties in sending/receiving faxes, I thought I would post details of our setup again - perhaps it will help others who have cable internet.

Internet connection - 25 Mbps down / 5 Mbps up (although I don't think link speed matters much at all).

The modem is a Surfboard SB5101. Downstream signal:noise ratio is 37 dB; Downstream power level = 3 dBmV; Upstream power level = 53 dBmV. These values matter quite a bit - downstream SNR should be >30 dB; downstream power level should be between -8 and 8 dBmV, and upstream power level should be <55 dBmV. Contact your cable internet provider if your modem reports values outside of this range.

We have our router connected to the cable modem. Both the Hub and the Telo are connected to this router. Our router uses dd-wrt firmware (don't think this matters much), but more importantly, we have the router's QoS configured to prioritize traffic to/from the Hub and Telo. Traffic to/from the Hub & Telo is restricted to 150 kbps, but given a priority of 0 (0 being the highest possible; for anyone else using dd-wrt, I've pasted our QoS script below).

Because nothing is connected to the home port of either the Hub or the Telo, QoS is disabled on both.

The fax machine, a Brother MFC7820N, is connected directly to the Hub (but the Telo works just as well). We don't have a DSL filter connected in the inverse position between the fax machine and the phone port of the Ooma device.

The Brother is configured to send faxes at: 1) Standard resolution; 2) 9600 bps; and 3) with ECM off. You might find this link useful to configure your fax machine - it has been posted by thunderbird a few times recently.

These settings can be configured for the MFC7820N (and similar Brother models) as follows:

To set the transmission rate to 9600 bps:
Press Menu
Use the arrow keys to find and select Fax (usually it is option 2)
Within the Fax menu, use the arrow keys to find and select Miscellaneous (usually option 0)
Within the Miscellaneous menu, find and select Compatibility (usually option 1)
Select Basic and push enter

ECM has to be turned off for each fax that your send. To do so:
Press the Fax button
Press Menu
Select Fax as detailed above
Within the Fax menu, use the arrow keys to find and select "Setup Send"
Now pick Overseas Mode within this menu, and set it to ON

Now enter the number to dial, prefixed with *99-pause, and send your fax.

Fax resolution can be set at the time of sending using the Resolution button. Set this to Standard.

Finally, two helpful numbers to test your fax machine:

To test sending & receiving, use HP's fax back service, by sending a fax to 888-473-2963.
To test sending, send a Fax to Faxtoy at 888-877-1655. Then go to http://faxtoy.net to see what it looks like at the receiving end.

Hope this helps!
Joyce

The dd-wrt QoS script is pasted below (the Ooma devices are 192.168.1.9 and 192.168.1.4)

Code: Select allinsmod ipt_layer7
TCA="tc class add dev br0"
TFA="tc filter add dev br0"
TQA="tc qdisc add dev br0"
SFQ="sfq perturb 10"
tc qdisc del dev br0 root
tc qdisc add dev br0 root handle 1: htb
tc class add dev br0 parent 1: classid 1:1 htb rate 24000kbit
$TCA parent 1:1 classid 1:10 htb rate 150kbit ceil 150kbit prio 0
$TCA parent 1:1 classid 1:11 htb rate 150kbit ceil 150kbit prio 0
$TCA parent 1:1 classid 1:12 htb rate 100kbit ceil 100kbit prio 0
$TQA parent 1:10 handle 10: $SFQ
$TQA parent 1:11 handle 11: $SFQ
$TQA parent 1:12 handle 12: $SFQ
$TFA parent 1:0 prio 0 protocol ip handle 10 fw flowid 1:10
$TFA parent 1:0 prio 0 protocol ip handle 11 fw flowid 1:11
$TFA parent 1:0 prio 0 protocol ip handle 12 fw flowid 1:12
iptables -t mangle -A POSTROUTING -d 192.168.1.9 -j MARK --set-mark 10
iptables -t mangle -A POSTROUTING -d 192.168.1.4 -j MARK --set-mark 11
iptables -t mangle -A POSTROUTING -d 192.168.1.5 -j MARK --set-mark 12
TCAU="tc class add dev imq0"
TFAU="tc filter add dev imq0"
TQAU="tc qdisc add dev imq0"
insmod imq
insmod ipt_IMQ
ip link set imq0 up
tc qdisc del dev imq0 root
tc qdisc add dev imq0 root handle 1: htb
tc class add dev imq0 parent 1: classid 1:1 htb rate 4500kbit
$TCAU parent 1:1 classid 1:10 htb rate 150kbit ceil 150kbit prio 0
$TCAU parent 1:1 classid 1:11 htb rate 150kbit ceil 150kbit prio 0
$TCAU parent 1:1 classid 1:12 htb rate 100kbit ceil 100kbit prio 0
$TQAU parent 1:10 handle 10: $SFQ
$TQAU parent 1:11 handle 11: $SFQ
$TQAU parent 1:12 handle 12: $SFQ
$TFAU parent 1:0 prio 0 protocol ip handle 10 fw flowid 1:10
$TFAU parent 1:0 prio 0 protocol ip handle 11 fw flowid 1:11
$TFAU parent 1:0 prio 0 protocol ip handle 12 fw flowid 1:12
iptables -t mangle -A PREROUTING -s 192.168.1.9 -j MARK --set-mark 10
iptables -t mangle -A PREROUTING -s 192.168.1.4 -j MARK --set-mark 11
iptables -t mangle -A PREROUTING -s 192.168.1.5 -j MARK --set-mark 12
iptables -t mangle -A PREROUTING -j IMQ --todev 0

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