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[hylafax-users] Far to often "No carrier detected"



Hej
I thougth I was an experiend HylaFAX user, as i have a 3 year old system running, which sends
about 300 faxes a day. - And the error rate is close to 0. This is Redhat 7.1, HylaFAX 4.1beta2
on some old 486 PC and a Multi-Tech MT1432 modem.
 
But. - About 14 days ago i installed a new system on a HP NetServer 800-serie (Pentium) with
Redhat 7.2 kernel 2.4.7-10  and  HylaFAX 4.1.2.
The system was supposed to send about 500 fax's each day, each fax of 1-2 pages.
I use two modems: Multi-Tech MT2834ZDXI and ZyXEL Omni56K (firmware 1.1).
This is currently a send-only system (ie. RingsBeforeAnswer=0).
 
I get the error "No carrier detected" far to often.
 
I found a lot of writing about the problem on the net, but no useful solution.
I hope some-one know  "how-to".
I have tried all kind off suggestions found in mailing-lists and FAQ's.
 
1) The ZyXEL modem:
This is not of much value, as the half of the times it gives the error "Invalid Dialing Command"
and the rest gives "No carrier detect". - Where do I get the recommended firmware version 1.2,
I can't find it on the net.
 
2) The Multi-Tech MT2834ZDXI:
Basically I use the standard .../config/mt-1432 config file with small variation:
ModemType:       Class2
ModemRate:    19200
ModemFlowControl:    rtscts
ModemSetupDCDCmd:    AT&C4            # recommended by Multi-Tech staf (the default is &C1)
 
I tried to change the modem initialy setup to:
        AT&F
        ATS38=35
        AT&F9
        AT&W0
 
I tried to use
        ATS7=75
        NoCarrierRetrys:    5
        JobReqNoCarrier:    10
 
None of the above made any difference.
The errorstats.sh script from Robert Colquhoun shows a rate of 240/1000
 
A typically log (last of 5 attempts) looks like:
....
....
Jun 11 09:27:52.67: [31753]: --> [2:OK]Jun 11 09:27:52.67: [31753]: <-- [13:AT+FPHCTO=30\r]
Jun 11 09:27:52.94: [31753]: --> [2:OK]
Jun 11 09:27:52.94: [31753]: <-- [24:AT+FDCC=1,5,2,2,2,0,0,0\r]
Jun 11 09:27:53.22: [31753]: --> [2:OK]
Jun 11 09:27:53.22: [31753]: <-- [20:AT+FLID="My Company"\r]
Jun 11 09:27:53.49: [31753]: --> [2:OK]
Jun 11 09:27:53.49: [31753]: DIAL 00441269597162
Jun 11 09:27:53.49: [31753]: <-- [21:ATDT0,00441269597162\r]
Jun 11 09:28:59.51: [31753]: --> [10:NO CARRIER]
Jun 11 09:28:59.51: [31753]: SEND FAILED: JOB 4055 DEST 00441269597162 ERR No carrier detected
Jun 11 09:28:59.51: [31753]: SEND FAILED: JOB 4055 DEST 00441269597162 ERR No carrier detected; too many attempts to dial
Jun 11 09:28:59.51: [31753]: <-- [5:ATH0\r]
Jun 11 09:28:59.78: [31753]: --> [2:OK]
Jun 11 09:28:59.78: [31753]: SESSION END
 
 
Any help/hints/comments appreciated,
Oluf
 



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