[Asterisk-Users] fax with asterisk

[Justin Richards]

Hmm I don't know what to think now.  I just tested again, using a
Cannon Multi-function laser fax/printer (G3) I got very few fake imput
errors, and the fax went through almost perfect. (PSTN to *)....

Using a Brother MFC 3820CN that is attached via IAXy on private LAN, I
get tons of fake imput's and a non-usable fax.

Keeping in mind that the Brother MFC / IAXy used to work fine before i
patched everything....  Is there any known issues using an IAXy with
fax machines?

I ordered a Sipura 2000 yesterday just to try out some other hardware
so when that gets in I'll try it out dedicating a port to the fax
machine.  I might simply stop using * fax all together if I can make
the Brother work well receiving through the Sipura..  I don't do a lot
of faxing, but I would like to know I'm going to receive them when I
do get one..


On Thu, 17 Feb 2005 11:43:39 -0700, Keith Burns
<kburns at porchlightcom.com> wrote:
> Some of the issues I have had with fax with IP Centrex (my team was
> responsible for an IP Centrex product at a CLEC) that sounds like you are
> having, had to do with a number of factors:
> 
> - Network: latency, jitter, packetloss... fax is intolerant
> - Gateways and IADs: echo cancellers incorrectly set and NSE incorrectly
> set, attenuation on the PSTN side incorrectly set
> - Fax type: G3 or superG3, the echo-can settings and NSE settings are
> different for each since they are completely different ;-)
> 
> Some of the symptoms were:
> - complete inability to send/receive faxes
> - partial faxes (x pages received/sent out of x+y total)
> 
> I have never heard of a noise component though... which would account for
> the scrambling you mentioned. The RTP wouldn't be modified in transit or the
> packets checksum would barf. Its sounds like it maybe getting scrambled by a
> terminal which in * case could be the transmit/receive fax machines or *
> itself.
> 
> I hate fax over VoIP. E-fax anyone? :-)