Re: some faxes not detected, but received on an "old" fax machine

On 08/27/2015 06:17 AM, Laurent Lesage wrote:
> The problem is that some caller can not send faxes. Hera attached, a 
> failed transmission.

> Aug 27 10:59:30.51: [ 2685]: SESSION BEGIN 000000327 3271391927
> Aug 27 10:59:30.51: [ 2685]: HylaFAX (tm) Version 4.4.4
> Aug 27 10:59:30.51: [ 2685]: <-- [4:ATA\r]
> Aug 27 10:59:36.54: [ 2685]: --> [7:CONNECT]
> Aug 27 10:59:36.54: [ 2685]: ANSWER: FAX CONNECTION  DEVICE '/dev/ttyACM0'
> Aug 27 10:59:36.54: [ 2685]: RECV FAX: begin
> Aug 27 10:59:36.54: [ 2685]: <-- data [32]
> Aug 27 10:59:36.54: [ 2685]: <-- data [2]
> Aug 27 10:59:36.55: [ 2685]: --> [7:CONNECT]
> Aug 27 10:59:36.55: [ 2685]: <-- data [23]
> Aug 27 10:59:36.55: [ 2685]: <-- data [2]
> Aug 27 10:59:36.55: [ 2685]: --> [7:CONNECT]
> Aug 27 10:59:36.55: [ 2685]: <-- data [13]
> Aug 27 10:59:36.55: [ 2685]: <-- data [2]
> Aug 27 10:59:38.78: [ 2685]: --> [2:OK]
> Aug 27 10:59:38.78: [ 2685]: <-- [9:AT+FRH=3\r]
> Aug 27 10:59:45.78: [ 2685]: --> [0:]
> Aug 27 10:59:45.78: [ 2685]: MODEM <Empty line>
> Aug 27 10:59:45.78: [ 2685]: <-- data [1]
> Aug 27 10:59:45.78: [ 2685]: --> [2:]
> Aug 27 10:59:45.78: [ 2685]: --> [2:OK]

The modem answers the call as instructed, sends NSF/CSI/DIS signals and 
then listens for the response from the sender.  However, the modem never 
hears the response from the sender.  And, after a few repeats HylaFAX 
gives up.

The following are possibilities:

1) The modem really can't hear the response from the sender due to line 
audio quality problems.  Maybe the fax machine is able to cope with the 
audio quality while the USR modem cannot.

2) Maybe the sender is not in-sync with us properly and somehow that is 
tripping-up our ability to detect their signaling.   Maybe try updating 
HylaFAX to something more-recent than 4.4.4?

3) Maybe the sender does not like our NSF/CSI/DIS signals, and so it 
disconnects.

> another question : is there a way to receive notification when such a 
> call appear? At this time, "FaxMaster" is not notified for those 
> failed attempts.

To HylaFAX it looks like a non-fax call came in, and so HylaFAX doesn't 
invoke faxrcvd (which implies a fax was received).  To detect non-fax 
calls you can look for CALL records in /var/spool/hylafax/etc/xferfaxlog 
that do not have a corresponding RECV record.

Thanks,

Lee.


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