[Freeswitch-users] Is FAXing reliable on FreeSwitch w/ T.38

[Steve Underwood]

On 05/02/2014 10:32 AM, bruce at sqls.net wrote:
> I've tried for a pretty long time to get faxing to work over SIP and I
> haven't had the best success either.
>
> But.. The Commtrex SmartATA seems to work better then most other ATAs
> I've used.  Also, the Audiocodes HTTPS fax works well but your tied to a
> vender that can support them like faxsipit, faxback, etc.    I also have
> a FS server running a couple of LUA/Sqlite scripts as a fax 2 email
> system and an Asterisk system with a a php web form for users to use
> when sending faxes (I'm going to convert that over to FS when I get more
> time to work on my LUA script).  With the server I get about 80-85%
> success rate but that includes occasional voice callers as well and it's
> a bit (in a way) inaccurate because often a fax caller will try 2-3
> times if there's a failure.  Sometimes a 2nd attempt works and other
> times it's just 2-3 failures.  Anyhow, 85% isn't that great but it's not
> horrible, I guess..
>
> Also, I'm using flowroute which by the way has outstanding support and
> they've helped me out A LOT with fax issues.
>
> I really want to find some ways to tweak or whatever the system to get
> in the 90-95% range.  I wish I knew enough to debug the various spandsp
> errors to know if there's something on my side I can change or adjust to
> improve the success rates.
85% success rate on the first try is appalling. You should be getting 
well below 1% failures on any half decent setup.

Regards,
Steve