Re: Hylafax / Avantfax outgoing fax poor quality

ECM is enabled by default.

Let's see a session log from a session where you believe it represents 
the problem.  Session logs are in /var/spool/hylafax/log.

Thanks,

Lee.


On 03/17/2016 01:08 PM, Tom Le wrote:
> Hi Lee,
>
> Yes, I suspected that so I called my telco support this morning, and 
> asked them to check the outgoing line quality, and they said it is as 
> good as the incoming line.
>
> I don't know if they are using VoIP on their end or not.  We used 
> these line on windows server 2003 fax server before, and we did not 
> have these complains.  The problem only started when we switched over 
> to hylafax, then we have couple of problems.  One problem is we used 
> usb trendnet windem, and kept get wedged both incoming and outgoing.  
> So I replaced with my old USRobotic external serial port modems, then 
> this is when the missing and fuzzy text started.
>
> I am using Class 1.  Below is my config.ttyS0 (outgoing) and I also 
> changed the xonxoff to rtscts to see if it help 2 weeks ago. It was 
> good for 7-8 days, and problem started again yesterday and today.
>
> ==========================
> #
> # Modem-related stuff: should reflect modem command interface
> # and hardware connection/cabling (e.g. flow control).
> #
> ModemType:              Class1          # use class 1 interface
> ModemRate:              19200           # rate for DCE-DTE communication
> #ModemFlowControl:      xonxoff         # software flow control
> ModemFlowControl:       rtscts          # software flow control
> #
> ===============================
>
> How do I check if my ECM is disabled
>
> Thanks
>
> Tom
>
>
>
> On 03/17/2016 12:46 PM, Lee Howard wrote:
>> Not all POTS lines are the same.  Not all long-distance services are 
>> the same.
>>
>> Does the telco or LD provider use VoIP on their end?
>>
>> In any case, the symptoms you described are indicative of poor line 
>> audio quality mixed with a goodly amount of non-ECM fax operations.
>>
>> Make sure you're running in Class 1 (and did not disable ECM).
>>
>> If that is the case (as I suspect it is) then the problem is really 
>> with the service of your telco or LD provider.
>>
>> Thanks,
>>
>> Lee.
>>
>>
>> On 03/17/2016 12:40 PM, Tom Le wrote:
>>> Hi Lee,
>>>
>>> I am just POTS line from a local telephone company.
>>>
>>> Thanks
>>>
>>> Tom
>>>
>>> On 03/17/2016 12:35 PM, Lee Howard wrote:
>>>> On 03/17/2016 12:31 PM, Tom Le wrote:
>>>>> Hi all,
>>>>>
>>>>> I am using hylafax v 6.0.5 with avant fax 3.3.3, and we are 
>>>>> experiencing poor quality on out going faxes.  The receiver 
>>>>> clients complaint about received faxes with missing text, compress 
>>>>> text or fuzzy text.  There is not problem with incoming faxes.
>>>>>
>>>>> We are using 2 external Serial Port US Robotics v.56 fax modem, 
>>>>> one for incoming and one for outgoing.
>>>>>
>>>>> Any advices that we can enhance the out going fax quality.
>>>>
>>>> What kind of phone lines are you using with your modems?
>>>>
>>>> Thanks,
>>>>
>>>> Lee.
>>>
>>>
>>>
>>
>
>
>


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