[Asterisk-Users] spandsp and certain (e.g. Canon) fax machines

[Steve Underwood]

Hi,

You are trying to receive from a Canon FAX machine. The problem I hope 
the change will fix is in sending *to* a Canon FAX machine. The user who 
found the bug in spandsp was trying to send to a Philips FAX machine. 
During negotiation the Philips sent a disconnect message, which is the 
same problem some people have with some Canon machines.

It is not clear from your log why you have problems training the V.29 
modem. Can you enable logging, by uncommenting the first line in t30.c, 
and send me the audio log files you will get in your /tmp directory.

Regards,
Steve


reseaux wrote:

>Dear Steve
>        i have try the SpanDSP (ver.k and latest Asterisk cvs) with the mod 
>you have 
>write below, but nothing my Canon Fax still dont send the fax:
>-----
>    -- Executing RxFAX("Zap/35-1", "/home/user/testfax.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 37 30 38 30 35 33 31 33 33 30 20 20 20 20 20 20 20 20 20 20
>TSI without final frame tag
>Remote fax gave TSI as: "0331350807"
><<< DCS: 83 00 86 a0 00
>DCS with final frame tag
>In state 9
>DCS:
>Can receive fax
>Selected data signalling rate: V.29, 9600bps
>2D coding OK
>Scan line length: 215mm
>Recording length: A4 (297mm)
>Minimum scan line time: 10ms
>Get at 9600
>Changed from phase 3 to 5
>Fast carrier up
>Coarse carrier frequency 1728.81 (11)
>Fast carrier down
>Fast carrier up
>Coarse carrier frequency 1699.38 (86)
>Fast carrier training failed
>Fast carrier down
>Fast carrier up
>Coarse carrier frequency 1700.06 (4917)
>Fast carrier down
>Fast carrier up
>Coarse carrier frequency 1699.33 (86)
>Fast carrier training failed
>Fast carrier down
>Fast carrier up
>Coarse carrier 1700.09 (4915)
>Fast carrier down
>Fast carrier up
>Coarse carrier frequency 1699.33 (86)
>Fast carrier training failed
>Fast carrier down
>Fast carrier up
>Coarse carrier frequency 1700.07 (2924)
>Fast carrier down
>    -- Executing NoOp("Zap/35-1", "DIALEDTIME=") in new stack
>    -- Executing NoOp("Zap/35-1", "ANSWEREDTIME=") in new stack
>    -- Executing Hangup("Zap/35-1", "") in new stack
>----
>
>I dont know how to debug more, you can give more help to trace the problem?
>Thanks in advance.
>Dimitri
>
>On Wednesday 25 August 2004 11:34, Steve Underwood wrote:
>  
>
>>Hi,
>>
>>Several people have reported problems sending faxes from spandsp-0.0.1k
>>to Canon FAX machines. A spandsp user had the same problem with another
>>make of FAX machine, and traced the problem to a bug in the file t30.c
>>of spandsp. Line 542 says s->t4.rx_file[0] where it should say
>>s->t4.tx_file[0]. This fixes his problem, and I suspect it will also fix
>>the Canon fax machine problem. Can someone having problems with Canon
>>machines try this change, and tell me the result?
>>
>>Regards,
>>Steve
>>
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