[asterisk-users] Problem with ReceiveFAX app from FFA

[Warren Selby]

On Mon, Jun 20, 2011 at 2:43 PM, Bryant Zimmerman <BryantZ at zktech.com>wrote:

> I concur we use the "h" extension to log inbound faxes to a database and
> then we process them outside the asterisk platform.  Our biggest issue with
> ReceiveFAX is about a 20% t.38 negotiation fail ratio. We then force fall
> back to t.30 for the next call from that number. We would like to see better
> success with t.38. Today our primary server has had 910 faxes of which 707
> negotiated t.38, 44 have failed darn robo dialers, The rest failed the first
> attempt and came in T.30 on the second call
>

I'm not sure how much of this is the fault of FFA versus the fault of shoddy
t.38 implementations out in the wild.  I've had a ton of headaches trying to
get t.38 solutions implemented with various ITSP's and FFA.  I've heard that
the free SpanDSP version has better negotiation rates, however, I have not
personally tested them.  In the end, for mission critical fax applications
(yes, these still exist, especially in the financial sector), I tend to go
with a dedicated line and DID used in conjunction with an FXO device or T1
device, an IAXModem connection over a local, low-latency LAN, and setup a
dialplan pass-through to a hylafax server.

-- 
Thanks,
--Warren Selby, dCAP
http://www.SelbyTech.com <http://www.selbytech.com>
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