[asterisk-users] Fax for Asterisk success rates?

[Brett Lehrer]

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.  

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.

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)?

Brett Lehrer