Unless Mistral's tech support and reliability have improved significantly over the last four years, I would not recommend that you use them. As well as having been told to "P*** off" by one of their "technicians" (who confused IP address with port number), their reliability over iSDN was poor. Additionally, they cut us off (a business account) when I inadvertently admitted that we were using a NAT router on the connection (same type as the one they recommended, one third the price, configured by myself instead of by them at 60 quid an hour).

Good luck if you do use them, but don't say I didn't warn you.