[Asterisk-Users] Fax with Asterisk and Sipura 2100

[Jorge Cisneros]

Change the
RTP Packet Size: 0.010

to

RTP Packet Size: 0.020

Asterisk only work with 2 frames.

I can't send any fax with other values.







On 1/5/06, Joash Herbrink <Joash.Herbrink at kahuna.nl> wrote:
>
> You could use a cisco ata 186.
> There aren't very cheap, but I have made them work on several of my
> customer sites with faxes.
>
> The ata just registers to the * server as a SIP endpoint.
>
> Also, echo cancelling and other "intelligent" things are bad when
> dealing with faxes and modems.
>
> Just use the cisco ATA (or any simple vegastream ATA device) to send /
> receive faxes.
>
> Codec should always be G.711 and no CNG or VAD or echo canceling should
> be used, fax machines take care of that themselves.
>
> (Contact me of list if you any of the mentioned devices)
>
> Joash
> joash at kahuna.nl
>
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Remco
> Barende
> Sent: Thursday, January 05, 2006 4:42 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Fax with Asterisk and Sipura 2100
>
> I tried to get it working for a very long time (over a year) with every
> possible set of config parameters I could find both for * as well as for
>
> the Sipura's. Echo cancelling etc. etc. all changed but still problems.
>
> I tried to get it working on an * box with a BRI line.
>
> Finally I have given up and attached a traditional ISDN -> Analog (A/B)
> converter to the ISDN line for the faxing bit next to Asterisk.
>
> I have yet to find a similar solution for faxing with a PRI, I'm afraid
> it
> will be impossible because as far as I know it's not possible to hook up
>
> some sort of A/B adapter next to the * box on one pri line.
>
> I think it can work if your fax machines are capable of capping fax
> tx/rx
> speeds to 9600 baud maximum without error correction. However it seems
> that not a single producer of FAX equipment (be it modems, all-in-one
> devices or even dedicated fax machines) offer such an option. HP doesn't
>
> seem very interested in capping the fax speeds for their all-in-one
> thingies.
>
> All fax products keep trying to transmit/receive at higher speeds
> after which the fax will fail completely or after the second page.
>
> Maybe there is a solution coming for PRI faxing. Junghanns informed me
> some time ago that they were working on a PRI card with a possibility to
>
> sync the clock to other cards.
>
> If this works in theory you could use a Junghanns PRI card and a
> Junghanns
> BRI card, sync the clocks and keep the path fully digital without lost
> frames. On their website however they only mention the possibility to
> interconnect the PRI cards, not (yet?) PRI <-> BRI.
>
>
>
> On Thu, 5 Jan 2006, Darrell Long wrote:
>
> > I know the subject of faxing has been covered in some detail, but I
> was
> > wondering if anyone has a hardware configuration similar to ours that
> has
> > faxes working successfully and would be willing to share any
> > settings/insight.
> >
> > We are unable to fax reliably with a Sipura 2100 connected to
> Asterisk. We do
> > not route calls over the Internet and our network has very low
> latency. The
> > Asterisk servers connect to Cisco Routers that have PRIs from various
> > carriers. We have all the recommended settings in the Sipura ATA, with
> Echo
> > Cancellation and Silence Suppression off, uLaw only for the codec,
> etc.
> >
> > While I realize that no faxes going through passthrough like this will
> work
> > 100% of the time, we currently have a less than 40% success rate with
> inbound
> > faxes being the worst.
> >
> > Any insight anyone has would be greatly appreciated!
> >
> > Best Regards,
> >
> >
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