[Asterisk-Users] SoftFAX/spandsp

[Steve Underwood]

Hi Rob,

The modem training is not even close to correct. It looks like the FAX 
software is not seeing good audio from the FAX machine. However, it 
might be a strange problem in my modem software. The way to investigate 
something like this is to look in spandsp-0.0.1/src/t30.c The first line 
is normally commented out. Remove the // so LOG_FAX_AUDIO is defined, 
rebuild and reinstall spandsp, restart * and try the fax again. You 
should find two files in your /tmp directory called fax-rx-audio-xxx and 
fax-tx-audio-xxx, where xxx is the date and time. These contain the 
audio streams in and out of the FAX software. Send them to me, and I 
will analyse (and hopefully fix) what is happening.

Regards,
Steve


Rob Fugina wrote:

>I just built the latest * from CVS, spandsp 1i, and hacked app_rxfax
>for the 'lock' parameters (I used 0 in all cases).  The result of my
>first fax transmission attempt is the following, which I post in case it
>helps the developers any...  The only thing I changed is the phone number
>(TSI), which was correct, btw...
>
>Of course, if it's obvious to someone that I did something wrong, please
>let me know...
>
>Thanx,
>Rob
>
>
>    -- Executing RxFAX("Zap/25-1", "/tmp/fax.tif") in new stack
>Changed from phase 0 to 1
>Slow carrier up
>Slow carrier down
>Slow carrier up
>Slow carrier down
>Start receiving document
>Changed from phase 1 to 4
>Sending ident
>  
>
>>>>CSI: 40 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
>>>>        
>>>>
>DIS:
>Preferred octets: 256
>Can receive fax
>Supported data signalling rates: V.27ter and V.29
>R8x7.7lines/mm and/or 200x200pels/25.4mm OK
>2D coding OK
>Scan line length: 215mm
>Recording length: A4 (297mm)
>Receiver's minimum scan line time: 0ms at 3.85 l/mm: T7.7 = T3.85
>R8x15.4lines/mm OK
>Minimum scan line time for higher resolutions: T15.4 = T7.7
>  
>
>>>>DIS: 80 00 ce f0 80 80 01
>>>>        
>>>>
>HDLC underflow in state 9
>Changed from phase 4 to 3
>Slow carrier up
><<< TSI: 43 34 38 36 34 20 34 39 39 20 34 31 33 20 20 20 20 20 20 20 20
>TSI without final frame tag
>Remote fax gave TSI as: "XXX XXX XXXX"
><<< DCS: 83 00 c6 f0 80 80 00
>DCS with final frame tag
>In state 9
>DCS:
>Can receive fax
>Selected data signalling rate: V.29, 9600bps
>R8x7.7lines/mm and/or 200x200pels/25.4mm OK
>2D coding OK
>Scan line length: 215mm
>Recording length: A4 (297mm)
>Minimum scan line time: 0ms
>Minimum scan line time for higher resolutions: T15.4 = T7.7
>Get at 9600
>Changed from phase 3 to 5
>Fast carrier up
>Fast carrier down
>Trainability test failed - longest run of zeros was 0
>  
>
>>>>FTT: 44
>>>>        
>>>>
>Fast carrier up
>Coarse carrier frequency 1674.67 (6)
>Training error 698.983520
>Training failed (convergence failed)
>Fast carrier training failed
>Fast carrier down
>Trainability test failed - longest run of zeros was 0
>  
>
>>>>FTT: 44
>>>>        
>>>>
>Fast carrier up
>Training failed (sequence failed)
>Fast carrier training failed
>Fast carrier down
>Trainability test failed - longest run of zeros was 0
>  
>
>>>>FTT: 44
>>>>        
>>>>
>Fast carrier up
>Coarse carrier frequency 1695.52 (6)
>Training error 664.526567
>Training failed (convergence failed)
>Fast carrier training failed
>Fast carrier down
>Trainability test failed - longest run of zeros was 0
>  
>
>>>>FTT: 44
>>>>        
>>>>
>Fast carrier up
>Training failed (sequence failed)
>Fast carrier training failed
>Fast carrier down
>Trainability test failed - longest run of zeros was 0
>  
>
>>>>FTT: 44
>>>>        
>>>>
>Fast carrier up
>Coarse carrier frequency 1566.39 (4)
>Training error 753.088253
>Training failed (convergence failed)
>Fast carrier training failed
>Fast carrier down
>Trainability test failed - longest run of zeros was 0
>  
>
>>>>FTT: 44
>>>>        
>>>>
>Fast carrier up
>Training failed (sequence failed)
>Fast carrier training failed
>Fast carrier down
>Trainability test failed - longest run of zeros was 0
>  
>
>>>>FTT: 44
>>>>        
>>>>
>Fast carrier up
>Fast carrier down
>Trainability test failed - longest run of zeros was 0
>  
>
>>>>FTT: 44
>>>>        
>>>>
>    -- Hungup 'Zap/25-1'
>
>
>  
>