[Asterisk-Users] Alternatives to SpanDSP??

[Eric Wieling aka ManxPower]

We have terrible problems sending faxes via the TDM cards.  Not even 
using SpanDSP.  Just TE110P for the telco side and TDM400P for the fax 
machine.

Steve Underwood wrote:
> Hi Julian,
> 
> Sounds like a frame slip problem if the result depends on the source. 
> Most people, including me, have trouble with the TDM cards. They worked 
> without problem when I was first developing the FAX software in spandsp, 
> so I assume the TDM driver has gathered bugs since that time.
> 
> Regards,
> Steve
> 
> 
> Julian J. M. wrote:
> 
>> Hi Steve,
>>
>> I sent a mail to this list a week ago regarding exactly this issue.
>> Spandsp doesn't work for me (getting <200rows tiffs), but sending and
>> receiving faxes through a FXS-FXO bridge (a TDM11B) works without
>> problems.
>>
>> My motherboard is based an Aopen AK33 (VIA686a chipset, KT133, 700Mhz
>> Athlon). I've disabled USB, 2nd IDE, VGA interrupt (runing without X),
>> sound.. I've also tweaked PCI settings in the BIOS, testing each time,
>> but I don't know what can be wrong. Here is some more info:
>>
>> cat /proc/interrupts
>>           CPU0
>>  0:   23411526          XT-PIC  timer
>>  2:          0          XT-PIC  cascade
>>  4:         80          XT-PIC  serial
>>  8:          1          XT-PIC  rtc
>> 10:   23322936          XT-PIC  wctdm
>> 12:          1          XT-PIC  acpi
>> 14:      91663          XT-PIC  ide0
>> 15:      51573          XT-PIC  eth0
>> NMI:          0
>> ERR:          0
>>
>> $ ./zttest
>> Opened pseudo zap interface, measuring accuracy...
>> 99.975586% 99.987793% 99.975586% 99.987793% 99.987793% 99.987793% 
>> 99.987793%
>> 99.987793% 99.987793% 99.975586% 99.987793% 99.987793% 99.987793%
>> 99.987793% 99.987793%
>> 99.987793% 99.975586% 99.987793% 99.975586% 99.987793% 99.987793%
>> 99.987793% 99.987793%
>> 99.975586% 99.987793%
>>
>> Thanks
>> Julian J. M.
>>
>> On 4/26/05, Steve Underwood <steveu at coppice.org> wrote:
>>  
>>
>>> Why would you expect a bunch of fax modems to work any better than
>>> spandsp? If spandsp doesn't work reliably your system is very likely 
>>> broken.
>>>
>>> I have had hundreds of complaints about spandsp reliability. I have
>>> analysed at least 50 or 60 audio logs. I have found maybe 5 or 6 which
>>> has real spandsp problems. The rest had frame slips. Of the 5 or 6 with
>>> real problems, most have been fixed in the latest version. I have one
>>> weird audio log from a new HP combination printer and fax machine that i
>>> haven't sorted out yet. These HP machines really are total crap. I have
>>> workarounds in spandsp for several blatently wrong things they do. I
>>> don't yet know who is at fault with this latest problem.
>>>
>>> Regards,
>>> Steve
>>>