Re: [hylafax-users] V.21 signal reception timeout +FCERROR

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

dev.malst wrote:
> We enabled “BadPageHandlingMethod: DCN” as you suggested. So why this 
> communication is not aborted ?
>
> hylafax received corrupted fax, we can find REJECT by page quality but 
> hylafax does not abort communication.
>
> Dec 09 09:49:20.87: [ 7678]: <-- [10:AT+FRM=74\r]
>
> Dec 09 09:49:22.91: [ 7678]: --> [7:CONNECT]
>
> Dec 09 09:49:22.91: [ 7678]: RECV: begin page
>
> Dec 09 09:49:47.04: [ 7678]: RECV: 971 total lines, 48 bad lines, 5 
> consecutive bad lines
>
> Dec 09 09:49:47.04: [ 7678]: RECV: end page
>
> Dec 09 09:49:47.04: [ 7678]: --> [10:NO CARRIER]

First page. This page is going to be confirmed.


> Dec 09 09:49:52.14: [ 7678]: RECV recv MPS (more pages, same document)
>
> Dec 09 09:49:52.14: [ 7678]: <-- [9:AT+FRS=7\r]
>
> Dec 09 09:49:52.32: [ 7678]: --> [2:OK]
>
> Dec 09 09:49:52.32: [ 7678]: RECV send MCF (message confirmation)

We confirmed it, and there are more pages coming...

> Dec 09 09:49:53.71: [ 7678]: <-- [10:AT+FRM=74\r]
>
> Dec 09 09:49:55.78: [ 7678]: --> [7:CONNECT]
>
> Dec 09 09:49:55.78: [ 7678]: RECV: begin page
>
> Dec 09 09:50:19.70: [ 7678]: RECV: 883 total lines, 50 bad lines, 5 
> consecutive bad lines
>
> Dec 09 09:50:19.70: [ 7678]: RECV: REJECT page quality, 94% good lines 
> (95% required)
>
> Dec 09 09:50:19.70: [ 7678]: RECV: end page
>
> Dec 09 09:50:19.70: [ 7678]: --> [10:NO CARRIER]

Second page. This page will not be confirmed.

> Dec 09 09:50:19.70: [ 7678]: <-- [9:AT+FRH=3\r]
>
> Dec 09 09:50:19.83: [ 7678]: --> [7:CONNECT]
>
> Dec 09 09:50:20.86: [ 7678]: --> [2:OK]
>
> Dec 09 09:50:20.86: [ 7678]: RECV recv MPS (more pages, same document)
>
> Dec 09 09:50:20.86: [ 7678]: <-- [9:AT+FRS=7\r]
>
> Dec 09 09:50:21.04: [ 7678]: --> [2:OK]
>
> Dec 09 09:50:21.04: [ 7678]: <-- [9:AT+FTH=3\r]
>
> Dec 09 09:50:22.01: [ 7678]: --> [7:CONNECT]
>
> Dec 09 09:50:22.01: [ 7678]: <-- data [3]
>
> Dec 09 09:50:22.01: [ 7678]: <-- data [2]
>
> Dec 09 09:50:22.44: [ 7678]: --> [2:OK]
>
> Dec 09 09:50:22.44: [ 7678]: RECV send DCN (disconnect)

And, true to your configuration, DCN is sent instead of RTN or MCF.

It did exactly what you wanted. I don't know what else you expected it 
to do.

When operating in non-ECM you're going to get corrupt pages. Your only 
choice is to accept them (MCF), reject them with RTN (which does not 
guarantee that the sender will interpret it as a request for 
retransmission), or disconnect with DCN (which hopefully gets the sender 
to call back and retransmit, but they still may not).

The *right* way forward is to employ ECM.

Thanks,

Lee.


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