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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