Re: [hylafax-users] Modem <empty line> message when receiving fax

[Lee Howard <faxguy@howardsilvan.com>]

On 2003.07.30 08:55 Philippe Balit wrote:

> Jul 30 11:40:16.75: [ 4851]: HylaFAX (tm) Version 4.1.6
> Jul 30 11:40:16.75: [ 4851]: <-- [13:AT+FCLASS=1A\r]
> Jul 30 11:40:22.04: [ 4851]: --> [7:CONNECT]
> Jul 30 11:40:22.04: [ 4851]: ANSWER: FAX CONNECTION  DEVICE
> '/dev/ttyS1'
> Jul 30 11:40:22.04: [ 4851]: RECV FAX: begin
> Jul 30 11:40:22.04: [ 4851]: <-- data [23]
> Jul 30 11:40:22.04: [ 4851]: <-- data [2]
> Jul 30 11:40:22.07: [ 4851]: --> [7:CONNECT]

We just sent CSI.

> Jul 30 11:40:22.07: [ 4851]: <-- data [10]
> Jul 30 11:40:22.07: [ 4851]: <-- data [2]
> Jul 30 11:40:24.02: [ 4851]: --> [2:OK]

We just sent DIS.

> Jul 30 11:40:24.02: [ 4851]: <-- [9:AT+FRH=3\r]

Now we expect to hear DCS (and possibly TSI) from the remote...

> Jul 30 11:40:27.12: [ 4851]: --> [0:]
> Jul 30 11:40:27.12: [ 4851]: MODEM <Empty line>

... but we hear absolutely nothing, not even the V.21 carrier, for 3.1 
seconds.  So we pause and try again...

> Jul 30 11:40:27.12: [ 4851]: <-- data [1]
> Jul 30 11:40:27.13: [ 4851]: --> [2:OK]
> Jul 30 11:40:27.13: [ 4851]: DELAY 1500 ms
> Jul 30 11:40:28.63: [ 4851]: <-- [9:AT+FTH=3\r]
> Jul 30 11:40:28.67: [ 4851]: --> [7:CONNECT]
> Jul 30 11:40:28.67: [ 4851]: <-- data [23]
> Jul 30 11:40:28.67: [ 4851]: <-- data [2]
> Jul 30 11:40:28.70: [ 4851]: --> [7:CONNECT]
> Jul 30 11:40:28.70: [ 4851]: <-- data [10]
> Jul 30 11:40:28.70: [ 4851]: <-- data [2]
> Jul 30 11:40:30.75: [ 4851]: --> [2:OK]
> Jul 30 11:40:30.75: [ 4851]: <-- [9:AT+FRH=3\r]
> Jul 30 11:40:33.24: [ 4851]: --> [7:CONNECT]

Okay, good.  This time we got the V.21 carrier.

> Jul 30 11:40:34.92: [ 4851]: --> [5:ERROR]
> Jul 30 11:40:34.92: [ 4851]: MODEM Command error
> Jul 30 11:40:34.92: [ 4851]: FCS error

But it appears that we aren't in sync with the remote, so we got a 
partial HDLC frame.  So we try again...

> Jul 30 11:40:34.92: [ 4851]: DELAY 1500 ms

If this continues then you may want to try changing 
Class1TrainingRecovery in your config file.  See 'man hylafax-config'.

Lee.

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