Re: [hylafax-users] Premature EOT from some fax machines

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Jason Reiser wrote:

> Jan 03 11:09:42.51: [10300]: SESSION BEGIN 000000148 16315551212
> Jan 03 11:09:42.51: [10300]: HylaFAX (tm) Version 4.2.3
> Jan 03 11:09:42.51: [10300]: <-- [4:ATA\r]
> Jan 03 11:09:55.50: [10300]: --> [9:+F34:11,1]
> Jan 03 11:09:55.50: [10300]: V.8 handshaking succeeded, V.34-Fax (SuperG3) 
> capability enabled.
> Jan 03 11:09:55.50: [10300]: Primary channel rate: 26400 bit/s, Control 
> channel rate: 1200 bit/s.
> Jan 03 11:09:55.50: [10300]: --> [7:CONNECT]
> Jan 03 11:09:55.50: [10300]: ANSWER: FAX CONNECTION  DEVICE '/dev/ttyM1b'
> Jan 03 11:09:55.50: [10300]: RECV FAX: begin
> Jan 03 11:09:55.50: [10300]: Control channel selected
> Jan 03 11:09:55.50: [10300]: <-- data [32]
> Jan 03 11:09:55.50: [10300]: <-- data [2]
> Jan 03 11:09:55.50: [10300]: <-- data [23]
> Jan 03 11:09:55.50: [10300]: <-- data [2]
> Jan 03 11:09:55.50: [10300]: <-- data [13]
> Jan 03 11:09:55.50: [10300]: <-- data [2]
> Jan 03 11:09:56.69: [10300]: EOT received (end of transmission)
> Jan 03 11:09:56.69: [10300]: RECV FAX: RSPREC error/got EOT
> Jan 03 11:09:56.69: [10300]: RECV FAX: end
> Jan 03 11:09:56.69: [10300]: SESSION END

The plain-english version of what's happening here is this:

HylaFAX answers the call with the modem.  The modem establishes a V.34 
connection at 26400 bps.  HylaFAX then sends the receiver prologue 
frames (NSF, CSI, DIS) through the modem to the sender.  About 1.2 
seconds later the modem tells us that the V.34 carrier dropped (which, 
since we didn't hang up, almost certainly indicates that the sender did).

This probably means that either the sender does not like the modem's 
V.34 signalling or the sender does not like one or more of our prologue 
frames.

If it works in Class 1 then it probably means that it is not NSF or CSI 
that is the problem, and it points the finger at the V.34 signalling 
(modem hardware responsibility) or the DIS frame (HylaFAX responsibility).

Let us know how Class 1 fares.

Thanks,

Lee.


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