Hi Steve,

My fax log contains the following (as you can see in my previous mail):
Transfer Rate: 14400
Thats why I thought that the other side tried to send its fax with this transfer rate even though I disabled the V.17 modem.

It cannot be a NAT problem, because I can receive the call, the connection is only dropped during the fax session. All the voice calls are OK, and my FreeSwitch is directly connected to the Internet.

I try to give y'all more details, hoping that somebody might experienced the same issue.
So the other part seems to successfully receive the ident (default: "spandsp fax ident"). After that my side sends the DIS, but the other side either doesn't get it or cannot interpret it, or the answer (DCS) is lost somewhere.
There are a few fax machines from which I can successfully receive faxes, but there are lots of machines from which I cannot receive anything.

My DIS is the following:

FLOW T.30 DIS:
FLOW T.30   .... ...0= Store and forward Internet fax (T.37): Not set
FLOW T.30   .... .0..= Real-time Internet fax (T.38): Not set
FLOW T.30   .... 0...= 3G mobile network: Not set
FLOW T.30   ..0. ....= V.8 capabilities: Not set
FLOW T.30   .0.. ....= Preferred octets: 256 octets
FLOW T.30   .... ...0= Ready to transmit a fax document (polling): Not set
FLOW T.30   .... ..1.= Can receive fax: Set
FLOW T.30   ..00 11..= Supported data signalling rates: V.27 ter and V.29
FLOW T.30   .1.. ....= R8x7.7lines/mm and/or 200x200pels/25.4mm: Set
FLOW T.30   1... ....= 2-D coding: Set
FLOW T.30   .... ..10= Recording width: 215mm +- 1%, 255mm +- 1% and 303mm +- 1%
FLOW T.30   .... 10..= Recording length: Unlimited
FLOW T.30   .111 ....= Receiver's minimum scan line time: 0ms at 3.85 l/mm; T7.7 = T3.85
FLOW T.30   1... ....= Extension indicator: Set
FLOW T.30   .... ..0.= Compressed/uncompressed mode: Compressed
FLOW T.30   .... .0..= Error correction mode (ECM): Non-ECM
FLOW T.30   .0.. ....= T.6 coding: Not set
FLOW T.30   1... ....= Extension indicator: Set
FLOW T.30   .... ...0= "Field not valid" supported: Not set
FLOW T.30   .... ..0.= Multiple selective polling: Not set
FLOW T.30   .... .0..= Polled sub-address: Not set
FLOW T.30   .... 0...= T.43 coding: Not set
FLOW T.30   ...0 ....= Plane interleave: Not set
FLOW T.30   ..0. ....= Voice coding with 32kbit/s ADPCM (Rec. G.726): Not set
FLOW T.30   .0.. ....= Reserved for the use of extended voice coding set: Not set
FLOW T.30   1... ....= Extension indicator: Set
FLOW T.30   .... ...1= R8x15.4lines/mm: Set
FLOW T.30   .... ..0.= 300x300pels/25.4mm: Not set
FLOW T.30   .... .1..= R16x15.4lines/mm and/or 400x400pels/25.4mm: Set
FLOW T.30   .... 1...= Inch-based resolution preferred: Set
FLOW T.30   ...1 ....= Metric-based resolution preferred: Set
FLOW T.30   ..0. ....= Minimum scan line time for higher resolutions: T15.4 = T7.7
FLOW T.30   .0.. ....= Selective polling: Not set
FLOW T.30   1... ....= Extension indicator: Set
FLOW T.30   .... ...0= Sub-addressing: Not set
FLOW T.30   .... ..0.= Password: Not set
FLOW T.30   .... .0..= Ready to transmit a data file (polling): Not set
FLOW T.30   ...0 ....= Binary file transfer (BFT): Not set
FLOW T.30   ..0. ....= Document transfer mode (DTM): Not set
FLOW T.30   .0.. ....= Electronic data interchange (EDI): Not set
FLOW T.30   1... ....= Extension indicator: Set
FLOW T.30   .... ...0= Basic transfer mode (BTM): Not set
FLOW T.30   .... .0..= Ready to transfer a character or mixed mode document (polling): Not set
FLOW T.30   .... 0...= Character mode: Not set
FLOW T.30   ..0. ....= Mixed mode (Annex E/T.4): Not set
FLOW T.30   1... ....= Extension indicator: Set
FLOW T.30   .... ...0= Processable mode 26 (Rec. T.505): Not set
FLOW T.30   .... ..0.= Digital network capability: Not set
FLOW T.30   .... .0..= Duplex capability: Half only
FLOW T.30   .... 0...= JPEG coding: Not set
FLOW T.30   ...0 ....= Full colour mode: Not set
FLOW T.30   .0.. ....= 12bits/pel component: Not set
FLOW T.30   1... ....= Extension indicator: Set
FLOW T.30   .... ...0= No subsampling (1:1:1): Not set
FLOW T.30   .... ..0.= Custom illuminant: Not set
FLOW T.30   .... .0..= Custom gamut range: Not set
FLOW T.30   .... 1...= North American Letter (215.9mm x 279.4mm): Set
FLOW T.30   ...1 ....= North American Legal (215.9mm x 355.6mm): Set
FLOW T.30   ..0. ....= Single-progression sequential coding (Rec. T.85) basic: Not set
FLOW T.30   .0.. ....= Single-progression sequential coding (Rec. T.85) optional L0: Not set
FLOW T.30   0... ....= Extension indicator: Not set
FLOW T.30 Tx: DIS with final frame tag

I even thought that the other side cannot interpret my DIS message, so I have to simplify it so it only contains the forst three bytes without the extensions. But I don't know whether or not it is possible in FreeSwitch without modifying the source code.

Thank you!

Cheers,
tmarlok

On 2014-09-01 14:44, Steve Underwood wrote:

Hi Tamas,

You have inspected the DIS and DCS messages, so you know the far end is 
not trying to send at 14,400 bps. It is, in fact, not communicating at 
all. You also know that you can disable V.17 successfully, as you have 
seen that the disable-v17 entry in the configuration data means the DIS 
message from FS no longer includes V.17. So, up to now you have said 
nothing useful which might get you a helpful reply, but you have said 
things that waste people's time.

My guess is you have a NAT problem, or something similar, which is 
completely blocking communication between the two FAX entities.

Regards,
Steve

On 09/01/2014 02:52 PM, Marlok Tamas wrote:

Thanks for the answer.

I forgot to mention, but I already disabled that.
My spandsp.conf (and fax.conf also) looks like this:

    <fax-settings>
    <param name="use-ecm"        value="false"/>
    <param name="verbose"        value="true"/>
    <param name="disable-v17"    value="true"/>
    <param name="ident"        value=" "/>
    <param name="header"        value=" "/>
        <param name="enable-t38" value="false"/>
    <param name="enable-t38-request" value="false"/>
    <param name="spool-dir"        value="/tmp"/>
    <param name="file-prefix"    value="faxrx"/>
    </fax-settings>

But still. I cannot receive fax from certain devices and I have this 
error message, which indicates that the other side is trying to send 
the fax with 14400 transfer rate.

9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:512 
==============================================================================
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:524 Fax processing not successful - result 
(48) Disconnected after permitted retries.
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:529 Remote station id:
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:530 Local station id: <stationid>
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:531 Pages transferred: 0
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:533 Total fax pages:   0
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:534 Image resolution:  0x0
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:535 Transfer Rate:     14400
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:537 ECM status         off
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:538 remote country:
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:539 remote vendor:
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:540 remote model:
9201aae0-771e-4ccf-a5c2-60fdbd3d6f6b 2014-08-28 18:35:39.627132 
[DEBUG] mod_spandsp_fax.c:542 
==============================================================================

The important part of the DIS (from my side) looks like this:

..00 11..= Supported data signalling rates: V.27 ter and V.29

No V.17. But I do not get an answer (DCS) to my DIS. So the fax 
processing dies after three retries.


On 2014-08-29 17:24, Brian West wrote:

<paramname="disable-v17"value="true"/>


in fax.conf.xml



On Fri, Aug 29, 2014 at 9:02 AM, Marlok Tamas 
<tamas.marlok@rackserver.hu <mailto:tamas.marlok@rackserver.hu>> wrote:

    Hi!

    I found this thread:
    http://lists.freeswitch.org/pipermail/freeswitch-users/2013-March/094032.html
    and I have the same problem (all faxes with transfer rate: 14400
    are dropped)

    It seems that nobody ha an answer back then for the question (is
    there any way of forcing freeswitch to use transfer rate: 9600)

    The result:

    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:512
    ==============================================================================
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:524 Fax
    processing not successful - result (48) Disconnected after
    permitted retries.
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:529 Remote
    station id:
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:530 Local
    station id: <local_number>
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:531 Pages
    transferred: 0
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:533 Total
    fax pages:   0
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:534 Image
    resolution:  0x0
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:535 Transfer
    Rate:     14400
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:537 ECM
    status         off
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:538 remote
    country:
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:539 remote
    vendor:
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:540 remote
    model:
    2014-08-29 15:21:39.187130 [DEBUG] mod_spandsp_fax.c:542
    ==============================================================================

    Thanks in advance!

    Cheers,
    tmarlok


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