[asterisk-users] Problems with rxfax

Mon Jan 22 13:19:48 MST 2007

I would install Hylafax(opensource too) with Asterisk via IAXModem, it
worth! You can keep all the features, hylafax running in same server or a
separated one, and IAXmodem will be a Modem on Hylafax, and a simple
extension on you *.

It works great for me, and there are more users using this architecture, you
can setup as much IAXModem as your servers can handle, so it's very
scalable.

Best regards,
Marco Mouta

On 1/22/07, Ardjan Zwartjes <A.Zwartjes at telecats.nl> wrote:
>
>  Dear list,
>
> The company I'm working for is trying to use app_rxfax to receive faxes on
> an Asterisk machine. Our initial tests looked very promising, but
> unfortunately we've encountered some problems. We've been trying to solve
> these problems for quite some time now, but we're running out of options. So
> I really hope that somebody can give some help here.
> Basically our set-up is this: We have an Asterisk server (version 1.2.7) with
> an ISDN trunk (Sangoma A104D), we've configured asterisk to run rxfax on a
> specified extension. Originally we started out with spandsp 0.0.2pre26 and
> the original app_rxfax for spandsp 0.0.2. Some of the faxes were coming in
> perfectly, but soon we noticed that quite often there were substantial
> pieces of the fax missing in the resulting tif file.
> We've tried the following to solve these problems:
>
> - We've checked the timing settings for the ISDN trunk, these seem to be
> ok.
> - We've tried several versions of libtiff (currently we are using 3.7.2).
> - We've tried using 0.0.3 versions of spandsp (since we're using asterisk
> 1.2.7 we had to modify app_rxfax.c to work).
> - We've created a custom dialplan application to disable the echo
> cancellation on the isdn channel on which the fax is received.
> - We've tried various settings for t30_set_supported_compressions,
> t30_set_supported_image_sizes, t30_set_supported_modems and
> t30_set_supported_resolutions (I must confes that I didn't really know which
> settings to use here, but we have tried a lot of them).
> - We've tried several fax machines to send the faxes, ranging from simple
> fax-modems to large dedicated fax machines.
>
> But still a lot of faxes give problems, either the tif is missing large
> portions, or the fax isn't received at all. At the bottom of this mail are
> 2 examples of the logging when it goes wrong. I really hope that somebody can
> give a few pointers. Thanks in advance,
>
> Kind regards,
> Ardjan Zwartjes,
> Telecats
>
> ======= Example 1 =========================
>
> Jan 19 14:49:14 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 0
> Jan 19 14:49:14 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 4
> Jan 19 14:49:17 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 4
> Jan 19 14:49:17 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 0
> Jan 19 14:49:19 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 8
> Jan 19 14:49:19 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 0
> Jan 19 14:49:20 DEBUG[24218] app_rxfax.c: FLOW FAX Switching from V.29 +
> V.21 to V.29 (-22.18dBm0)
> Jan 19 14:49:21 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 0
> Jan 19 14:49:21 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 4
> Jan 19 14:49:23 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 8
> Jan 19 14:49:23 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 0
> Jan 19 14:49:23 DEBUG[24218] app_rxfax.c: FLOW FAX Switching from V.29 +
> V.21 to V.29 (-17.84dBm0)
> Jan 19 14:49:38 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 4
> Jan 19 14:49:38 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 0
> Jan 19 14:49:39 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 0
> Jan 19 14:49:39 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 4
> Jan 19 14:49:41 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 8
> Jan 19 14:49:41 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 0
> Jan 19 14:49:42 DEBUG[24218] app_rxfax.c: FLOW FAX Switching from V.29 +
> V.21 to V.29 (-19.13dBm0)
> Jan 19 14:49:48 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 4
> Jan 19 14:49:48 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 0
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c:
> ==============================================================================
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c: Pages transferred:  1
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c: Image size:         1728 x 1192
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c: Image resolution    8037 x 7700
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c: Transfer Rate:      9600
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c: Bad rows            0
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c: Longest bad row run 0
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c: Compression type    3
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c: Image size (bytes)  0
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c:
> ==============================================================================
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 0
> Jan 19 14:49:49 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 4
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 0
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 1
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c:
> ==============================================================================
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: Fax successfully received.
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: Remote station id:
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: Local station id:  "Test Fax"
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: Pages transferred: 1
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: Image resolution:  8037 x 7700
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: Transfer Rate:     9600
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c:
> ==============================================================================
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: FLOW FAX Set rx type 13
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: FLOW FAX FAX exchange complete
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: FLOW FAX Set tx type 13
> Jan 19 14:49:51 DEBUG[24218] app_rxfax.c: FLOW FAX FAX exchange complete
> Jan 19 14:49:53 DEBUG[24218] app_rxfax.c: Got hangup
> =========Example 2==================
> Jan 18 09:56:12 VERBOSE[4185] logger.c:     -- Executing RxFAX("Zap/31-1",
> "/tmp/1169110572.239.tif|debug") in new stack
> Jan 18 09:56:15 DEBUG[4185] app_rxfax.c: FLOW FAX Set rx type 0
> Jan 18 09:56:15 DEBUG[4185] app_rxfax.c: FLOW FAX Set tx type 4
> Jan 18 09:56:17 DEBUG[4185] app_rxfax.c: FLOW FAX Set rx type 4
> Jan 18 09:56:17 DEBUG[4185] app_rxfax.c: FLOW FAX Set tx type 0
> Jan 18 09:56:19 DEBUG[4185] app_rxfax.c: FLOW FAX Set rx type 8
> Jan 18 09:56:19 DEBUG[4185] app_rxfax.c: FLOW FAX Set tx type 0
> Jan 18 09:56:26 DEBUG[4185] app_rxfax.c: FLOW FAX Set rx type 0
> Jan 18 09:56:26 DEBUG[4185] app_rxfax.c: FLOW FAX Set tx type 4
> Jan 18 09:56:27 DEBUG[4185] app_rxfax.c: FLOW FAX Set rx type 0
> Jan 18 09:56:27 DEBUG[4185] app_rxfax.c: FLOW FAX Set tx type 1
> Jan 18 09:56:27 DEBUG[4185] app_rxfax.c:
> ==============================================================================
> Jan 18 09:56:27 DEBUG[4185] app_rxfax.c: Fax receive not successful -
> result (31) Carrier lost during fax receive.
> Jan 18 09:56:27 DEBUG[4185] app_rxfax.c:
> ==============================================================================
> Jan 18 09:56:27 DEBUG[4185] app_rxfax.c: FLOW FAX Set rx type 13
> Jan 18 09:56:27 DEBUG[4185] app_rxfax.c: FLOW FAX FAX exchange complete
> Jan 18 09:56:27 DEBUG[4185] app_rxfax.c: FLOW FAX Set tx type 13
> Jan 18 09:56:27 DEBUG[4185] app_rxfax.c: FLOW FAX FAX exchange complete
> Jan 18 09:56:39 DEBUG[4185] app_rxfax.c: Got hangup
>
>
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