International outgoing fax fails with GV

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Irina:
I set up OBi202 with GV in October and was able to send an international fax three months ago.
For some reason now fax doesn't go through. My GV has a NJ number. I am using HP Officejet 61 Series 6110, and it all-in-one(printer/fax/copier/scanner).
I am getting communication error 338, 350 or 441. Both of them just recommend to re-send the fax.
I do have money on my GV account, and after each attempt to send a fax, the account has being charged for a couple of cents.
I dial 011 xxx xx xxx xxxx and also tried without 011 - the result is the same:
It is connecting, trying to send page 1, and then fails
I called to verify the FAX number - it is correct.

Disconnected the electricity cable from OBi202 for about 10 min, and reset the device.

Tried to send in different times of day and night
I do not understand, what happens and why I cannot send the fax at all.

Appreciate if somebody can help me.

Thank you.

drgeoff:
The usual recommendation is to try setting your fax machine to a lower speed.  However a look through the manual for your machine suggests that it is fixed at 33.6 kbit/s.

Try toggling the error correction mode (ECM).

Irina:
Thank you for suggestion.
Tried ECM right away, but the fax failed again.

drgeoff:
Probably the route that GV is using to your destination incorporates a section with a low bit rate codec (intended for voice) which cannot sustain a 33.6 kbit/s modem signal.

http://www.voipmechanic.com/voip-fax-settings-9600-baud.htm suggests there are "hidden" settings to reduce the modem speed.  I found this by Googling and cannot vouch for it.

azrobert:
Nobody is addressing the quality and speed aspect. I'm not a network expert, but I'll give it a shot.

Check the quality of your internet connection here:
http://myspeed.visualware.com/index.php
Try Voip and Quality options.
Select the G711 codec

This is my summary for comparison:
VoIP test statistics
Jitter: you --> server: 0.5 ms
Jitter: server --> you: 3.4 ms
Packet loss: you --> server: 0.0 %
Packet loss: server --> you: 0.0 %
Packet discards: 0.0 %
Packets out of order: 0.0 %
Estimated MOS score: 4.2
Try different sites. The results will vary.

Check your internet speed here:
http://www.speedtest.net/index.php?nojs=1

Do you have a quality problem?
Is your internet speed close to your ISP plan?

If problems:
You can try changing cables.
Don't use cheap cables from Ebay.
They should be rated at least Cat5E.

If you have Cable service does your modem support DOCSIS 3.x?
DOCSIS 2.x only supports 1 channel.
DOCSIS 3.x supports multiple channels.
This probably won't help unless your service plan is around 40Mbps or higher.
Each channel supports 42.88 Mbps, so I don't know if multiple channels will help throughput on a slower connection.

Edit:
Are you using an OBiWiFi dongle?
If yes, you can try a hard wire connection to your router.

Don't forget to check the cable between the router and modem.

If you have cable service, make sure all the coax connections are tight.
Try not to use any splitters.

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