Re: [hylafax-users] "COMREC invalid response.." persisting in HylaFAX+ 5.2.0

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Walter Hop wrote:
> Dec 12 14:59:02.53: [ 1373]: HylaFAX (tm) Version 5.2.0

Good.  I needed you here so that I could be confident that you're not 
running into an issue that I've already solved that somehow just hasn't 
made it's way to hylafax.org releases.

> Dec 12 14:59:31.19: [ 1373]: SEND send PPS (partial page signal)
> Dec 12 14:59:31.19: [ 1373]: SEND send EOP (no more pages or documents)
> Dec 12 14:59:31.19: [ 1373]: <-- [9:AT+FRH=3\r]
> Dec 12 14:59:31.33: [ 1373]: --> [7:CONNECT]
> Dec 12 14:59:32.55: [ 1373]: --> HDLC<5:FF C8 5F C8 E7>
> Dec 12 14:59:32.56: [ 1373]: --> [2:OK]
> Dec 12 14:59:32.56: [ 1373]: SEND recv DCN (disconnect)


Okay, so I think that these are the possibilities...

1) The receiver may not like the V.17 short-train that this modem 
produces.  In other words, a slight incompatibility between the modem 
and the receiver.

2) There may be a particular audio distortion between the modem and the 
receiver that amount to the same as #1.

3) The receiver may not like the MMR image data that we're sending... or 
there is some kind of incompatibility between HylaFAX's encoder and the 
receiver's MMR decoder.

4) There may be some unlikely quirk in our ECM protocol that the 
receiver does not like.

5) The receiver always sends DCN in response to EOP (and thus is broken).

I don't know how you're submitting tests to this destination, but for 
this troubleshooting I'll need you to use sendfax.  First, I need you to 
run a control test without making any changes to the configuration.  
Please run:

 echo "This is just a test." | textfmt > /tmp/test.ps
 sendfax -n -3 -t 1 -F "test" -h cuad0@ -d 003232xxxxxx /tmp/test.ps

This control test should result in the same thing: "COMREC invalid 
response received to PPS."  If it does not result in this then stop 
testing.  The problem then likely has to do with some particulars of the 
image data that you're submitting, and I'll need to give you new 
instructions for testing.

If that test results in the same error, then you need to make one change 
to the modem configuration file so that we can control the tests more 
specifically.  In the modem config file put:

 ModemSoftRTFCC: no

Please run the following tests in this order.  To test #5 please run:

 sendfax -n -3 -t 1 -F "test" -h cuad0@ -d 003232xxxxxx /tmp/test.ps 
/tmp/test.ps

This *should* fail after the first page, after PPS-MPS instead of 
PPS-EOP.  If the receiver responds MCF to PPS-MPS and then DCN to 
PPS-EOP, then stop; the issue probably is #5, and there's not much that 
we can do about it.  Make sure that the receiver is actually printing 
out all of the pages.

To test #3 please run:

 sendfax -n -1 -t 1 -F "test" -h cuad0@ -d 003232xxxxxx /tmp/test.ps

If this fails then we know that the image data itself is not likely the 
problem.  If this succeeds, then stop; #3 is probably the issue; let me 
know if the receiver is actually printing out all of the pages or not.

To test #4 please run:

 sendfax -n -1 -E -t 1 -F "test" -h cuad0@ -d 003232xxxxxx /tmp/test.ps

If this fails then we know that the problem is not with any particulars 
of the ECM protocol as employed by the receiver or HylaFAX.  If it 
succeeds, then stop; #4 is likely the issue; again, let me know if the 
receiver is printing out all of the pages.

To test #1 please run:

 sendfax -n -3 -t 1 -F "test" -h cuad0@ -B 9600 -d 003232xxxxxx 
/tmp/test.ps

and then also:

 sendfax -n -3 -t 1 -F "test" -h cuad0@ -B 4800 -d 003232xxxxxx 
/tmp/test.ps

If either of these succeed then #1 is likely the issue.  If either does 
succeed then run the control test with different modems (in particular 
modems with different chipsets) and see what happens.  If both fail then 
#2 is likely the problem.

If #2 is likely the problem then it probably means that somewhere 
between you and the receiver the telephone audio is getting distorted.  
Try different phone lines... in particular phone lines with other 
telcos, (if possible).  Have the telco check that call connection, if 
possible.  If anyone's using VoIP in the call path (you, the receiver, 
or the telcos) then VoIP is probably to blame.

If you get to the end of this and still don't have any glaring suspects, 
then it's time that we involve the receiver a bit more... what kind of 
fax machine is it?  What kind of error message are they getting?  Do 
they have other fax reception problems?

Thanks,

Lee.


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