[Asterisk-Users] spandsp, rxfax, TDM400/zaptel, missed frames, any help?

[Ben Fried]

Since writing my message, I appear to have had success using iaxmodem
+ hylafax to do inbound faxing. Setup was not completely obvious,
especially if you're usin a at h, like me, I finally seem to have inbound
faxes working properly now - 5 or 6 in a row have all come in just
fine.

Ben

On 1/16/06, Philip Edelbrock <phil at netroedge.com> wrote:
>
>
> Ben Fried wrote:
> > On 1/9/06, Rich Adamson <radamson at routers.com> wrote:
> >
> >>>Sorry in advance if this is a FAQ...
> >>>
> >>>I've got a working Asterisk setup based on A at H 2.2. I have a TDM400
> >>>card with 2 FXS and 2 FXO ports; PSTN connections come in via the TDM
> >>>card.
> >>>
> >>>I haven't been able to get inbound fax with spandsp and rxfax to work.
> >>>Occasionally an all-text fax will come in, though it's usually badly
> >>>corrupted, but in most cases, it would appear that the call is
> >>>terminated without successful transmission of the fax. I get logs that
> >>>look what's included below.
> >>>
> >>>>From reading the list, it looks like this is caused by the TDM card
> >>>missing frames. Does that sound correct? If so, is there any relief in
> >>>sight?
> >>
> >>Its been a problem since the card came out a couple of years ago. So, no
> >>it does not appear there is any relief in sight.
> >
> >
> > Sigh. What a disappointment! Are there any other options for home
> > users to receive faxes over the PSTN through *? Is anyone working on
> > an alternative to the zaptel driver that might fix this issue?
> >
>
> Humm, I tried to get my TDM400 card accepting faxes last week.  It works
> about 1 out of 8 times.  When it works, it looks great.  When it
> doesn't, I usually (but not always) get a 'poor line quality' error from
> the sending fax machine and a blank or small corrupt image.
>
> I've tried adjusting the gain up and down, reversing ring/tip, and a few
> other little things.  I wonder if it helps to adjust some other settings
> in the zapata.conf, like echo cancellation?
>
> My hope is dwindling, though, after reading this thread. :'(  I do have
> a couple unused X100P clones sitting in that box that might be worth a
> try...
>
>
> Phil
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