[asterisk-users] Fax for Asterisk success rates?

[Joshua Colp]

Brett Lehrer wrote:

Hola,

> I'm running Asterisk 1.8.11.1 and am connected to the nexVortex trunking service over a DSL line solely dedicated to VoIP usage.  For both incoming and outgoing faxes, I'm getting a failure rate of just over 25%, and over a handful of reasons.

I've never heard of that service so I unfortunately don't know the 
underlying equipment they are using for their service but it makes a 
*huge* difference.

T.38 (which I hope you are using as that increases the chances a bit 
more) implementations wildly differ in interoperability and how well 
they generally work. This is one of the big problems with doing fax over 
VoIP and why for some individuals it works great and why for others it 
just falls apart.

> Is it natural to have this many problems on a completely digital configuration?  I'm trying to cut our analog phone line (because it's so expensive), but some fax machines just don't seem to ever accept a fax.  Many of the failures are on the same numbers, forcing me to fall back to an old analog fax machine just to make sure it actually gets through.

In a perfect world, no. In reality it depends as I mentioned above.

> Has anyone else had any similar experiences, or is this indicative of a failure in the setup on my end (or even the trunking service)?

Without more information (like logs/etc) it's hard to isolate things and 
point fingers.

Cheers,

-- 
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at:  www.digium.com  & www.asterisk.org