I'm not sure internal use are referring to hardware pbx?
Hosted pbx simply an alternative to hardware based pbx that allow you to have full functionality similar to hardware, as well as some additional function that further expand advantages of hosted pbx.
You may need basic knowledge of server management.
Is UK a must location for you?
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Thanks for the replies, I have found what I was looking for now. It was just the understanding of the implementation of ISDN30 Lines/Channels and DDIs which I wasn't 100% sure on. I have now spoken with BT, Our DC, Asterisk and Snom.
So now just investigating the PBX GUI,
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