We have been using TelNet Worldwide for a year now...

We have been using TelNet Worldwide for a year now. Switching to Telnet was easy process, for porting numbers and scheduling it all. Voice quality has been great. We tried faxing through are pbx. But it's not the correct technology for faxing. We had to switch to the T38 fax service.
The one negative is that tech support feels like I get the run around. But eventual they got my issue fixed.