This is clearly a bug, bugs go in JIRA, even if you can't replicate the issue properly or understand it please put the issue in JIRA, I've been chasing an interop issue with 3cx that sounds very much like some of the info in this email thread.

https://freeswitch.org/jira/browse/FS-8862





On Tue, May 17, 2016 at 3:30 PM, Steven Schoch <schoch+freeswitch.org@xwin32.com> wrote:
On Tue, May 17, 2016 at 12:45 PM, Moishe Grunstein <max@nysolutions.com> wrote:

Why don’t you put all this in Jira?


Jira is for problem reports, and I can't reproduce the problem to report it. It all works now.
I just tried it from a FAX machine on a POTS line, and the FAX was received without any errors.

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