Hi!
May I suggest you ask on DSLReports or another similar site?
FreePBX/Sangoma has their own SIP provider (SIPstation) and while they don't have European servers any other provider we might suggest also has servers which compete with them in North America...
This is probably one of the reasons you are not getting any answers to your query...
It's fair play to talk of other providers when we are trying to fix/debug a problem with them I think but it sounds to me like it's quite another to actually suggest a provider to use, to do business with...
Good luck and have a nice day!
Nick