How to configure a GD1370NA Fax board to work with a Grandstream HT801 ATA

[SalesServiceGuy]

I wasted a good hour trying to get a e4525AC/GD1370NA fax board connected to a GrandStream ATA to send a fax.

I played round with all kinds of settings in Field Service 13 fax mode but I could not get the fax board to transmit a fax.

I could see the customer's fax trying to connect with my same fax board and I got all of the usual handshake noises but the fax would not transmit.

I finally discovered the customer is using a Grandstream HT801 ATA (analog telephone adaptor) but I am unable to give the IT Manager any advise on how to configure it.

Does anyone have any experience with this?

In the past, I was working with a Cisco ATA. This large custoner's IT Dept was convinced it was the copier's faullt but in the end they had to enable a passthrough

[SalesServiceGuy]

Re: How to configure a GD1370NA Fax board to work with a Grandstream HT801 ATA

... there are YouTube videos to watch on ATA switches but this seems to be IT's responsibility.

I got dial tone and I have proof the customer's fax board tried to connect to my same model fax board.

[mojorolla]

Re: How to configure a GD1370NA Fax board to work with a Grandstream HT801 ATA

When fighting VOIP I always:
-make sure the actual phone cord is a 2-line, not the old style 4-line
-drop baud rates to 9600 (tx & rx)
-turn of ECM
-set coding to MMR
VOIP is also very susceptible to network jitter and packet loss. The VOIP line should also be uncompressed (g 711 codec)
You can find a good read here:
Make Faxing over VoIP work with these fax settings for VoIP (voipmechanic.com)

[Rusty.Harris]

Re: How to configure a GD1370NA Fax board to work with a Grandstream HT801 ATA

I usually use the settings that TABS says to use.
These settings I came up with a LONG time ago when VoIp started.
When I have one that just won't work, I send out this batch. Most of the time it fixes
the issue. 13-337 you might want to disable if the customer doesn't want to hear
the noise up to Phase B.
Some of these probably aren't needed any more, but I just never changed them.

104 Dial tone check PSTN,DTC or LCC, Line1 0
110 Dial tone check PABX, DTC or LCC, Line2 0
149 Receiver attenuator, Line 1 1,2
200 Exchange Type POTS/PABX, Line1 1
210 Exchange Type POTS/PABX, Line2 1
224 Dial tone check PSTN, DTC or LCC, Line2 0
230 Dial tone check PSTN, DTC or LCC, Line2 0
279 Receiver attenuator, Line 2 1,2
325 TX attenuator, Line 1 11-15
329* Cable equalizer for RX 1
331 Echo Delay 0
335 Modem Default speed 1
337 Speaker sound on up to Phase B (customerpreference) 1
346 Recording width capacity declaration 1
391 ECM Function 0
430 TX attenuator, Line2 11-15
434* Cable equalizer, Line2 1
512 Image error rate 3
565 Fallback condition for transmitter, Line1 8
569 Maximum Line Speed 6
571 Sub/Sep/Password 0
574 Coding compression 1
611 Fallback condition for transmitter, Line2 8
618 Maximum Line Speed 6
619 Rx capacity declaration, Line1 0
620 Rx capacity declaration, Line2 0
518 Duplex received fax 1