The help text of Syntellect (formerly known as Envox) concerning fax is not very helpful and sometimes quite confusing, when you just want to recieve fax messages with the same script that should also answer voice calls.
The support of Syntellect (and their partner Bressner) was unsatisfactory: long waiting times for an answer of the Syntellect experts, and some of these answers weren’t helpful at all (e.g. similar abstract information as in the help files)