[Asterisk-Users] rxfax(spandsp-0.0.2pre18) and HT488

[Rich Adamson]

Steve, what would help a bunch of people trying to implement your
spandsp is some kind of help document that at least attempts to
describe some of the debug statements shown below. When the average
person reads "hdlc underflow" or "T4 timeout in state 9", we don't
have a clue what those statements really mean or even if they need
to be addressed. I've probably spent at least 60 hours doing the 
same thing and finally gave up.

If you really want to reduce your support overhead for spandsp, put
something together that gives the implementor at least some clues
how to read that stuff, and maybe even a clue how to resolve some
of the more common issues. The foip.html appears to be a reasonable
'background', but certainly not anything reaonable to resolve the
OP debug output below.

------------------------

> See http://www.soft-switch.org/foip.html
> 
> Steve
> 
> 
> Zen Kato wrote:
> 
> >After I did rxfax(...|debug), I got the followings;
> >......(snip).......
> >  
> >
> >>>>DIS: 80 00 ce f4 80 80 81 80 80 80 18
> >>>>        
> >>>>
> >HDLC underflow in state 9
> >Changed from phase 4 to 3
> >T4 timeout in state 9
> >Changed from phase 3 to 4
> >DIS:
> >  Prefer 256 octet blocks
> >  Can receive fax
> >  Supported data signalling rates: V.27ter and V.29
> >  R8x7.7lines/mm and/or 200x200pels/25.4mm
> >  2D coding
> >  Scan line length: 215mm
> >  Recording length: Unlimited
> >  Receiver's minimum scan line time: 0ms at 3.85 l/mm: T7.7 = T3.85
> >  R8x15.4lines/mm
> >  Minimum scan line time for higher resolutions: T15.4 = T7.7
> >  North American Letter (215.9mm x 279.4mm)
> >  North American Legal (215.9mm x 355.6mm)
> >  
> >
> >>>>DIS: 80 00 ce f4 80 80 81 80 80 80 18
> >>>>        
> >>>>
> >HDLC underflow in state 9
> >Changed from phase 4 to 3
> >T2 timeout
> >Start receiving document
> >Changed from phase 3 to 4
> >DIS:
> >  Prefer 256 octet blocks
> >  Can receive fax
> >  Supported data signalling rates: V.27ter and V.29
> >  R8x7.7lines/mm and/or 200x200pels/25.4mm
> >  2D coding
> >  Scan line length: 215mm
> >  Recording length: Unlimited
> >  Receiver's minimum scan line time: 0ms at 3.85 l/mm: T7.7 = T3.85
> >  R8x15.4lines/mm
> >  Minimum scan line time for higher resolutions: T15.4 = T7.7
> >  North American Letter (215.9mm x 279.4mm)
> >  North American Legal (215.9mm x 355.6mm)
> >  
> >
> >>>>DIS: 80 00 ce f4 80 80 81 80 80 80 18
> >>>>        
> >>>>
> >......(snip).......
> >
> >Does HT488 version-1.0.1.2 work OK?
> >