I have been using distinctive ring in Hylafax with a Multitech
MT5634ZPX-PCI
for the last 6 months or so without problems. But since the MT sends
DRON/DROFF codes for distinctive rings and Hylafax does not as yet
support
that, I wrote a patch for it which can be downloaded from the hylafax
wiki
website: http://wiki.ifax.com/tiki-index.php and go to
HowTo->Integration.
General note: Within a few weeks I'm hoping to release a new version
of the
patch to handle any arbitrary distinctive ring pattern. The current
version
is known to work only within the U.S.