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[hylafax-users] False "Busy signal detected" error



Hylafax 4.2.1
Conexant HCF PCI modem + Linuxant's commercial driver version 1.07
SuSE Linux 9.1

Receiving has been working flawlessly for a few months.
But a recurring problem happens when we try to send a fax using Hylafax
  1. "Busy signal detected" is reported when the remote line is NOT busy.
  2. Hylafax requeues the fax and tries again. 
  3. Sometimes, after the 4th or 5th try, Hylafax manages to send the fax.

I can confirm that the remote fax line has been idle all the time! So why
does Hylafax reports a busy signal? And why it sometimes succeeds in
sending the fax after a few tries? This doesn't seem deterministic!

A session transcript:

[12216]: SESSION BEGIN 000000240 352226975647
[12216]: HylaFAX (tm) Version 4.2.1
[12216]: SEND FAX: JOB 21 DEST 226975647 COMMID 000000240 DEVICE
'/dev/modem'
[12216]: STATE CHANGE: RUNNING -> SENDING
[12216]: MODEM input buffering enabled
[12216]: Apply DialString rules to "226975647"
[12216]: --> return result "226975647"
[12216]: <-- [14:AT+FCLASS=1.0\r]
[12216]: --> [2:OK]
[12216]: MODEM set XON/XOFF/FLUSH: input ignored, output disabled
[12216]: DIAL 226975647
[12216]: <-- [14:ATDT226975647\r]
[12216]: --> [4:BUSY]
[12216]: SEND FAILED: JOB 21 DEST 226975647 ERR Busy signal detected
[12216]: <-- [5:ATH0\r]
[12216]: --> [2:OK]
[12216]: MODEM set DTR OFF
[12216]: STATE CHANGE: SENDING -> MODEMWAIT (timeout 5)
[12216]: SESSION END


Thanks,
Mark


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