VOIP & Telcos

Hi, Im currently doing research on a school project on VOIP (Business class), and how its currently benefiting telco’s in customer satisfaction and of course, in monetary terms 😉

Can someone help me out with the following? As Im based in the UK, any answers relevant to my location would be great.

1; How much is it costing the Telco’s to provide VOIP? I know that the end user would of course need a broadband connection, but how much are calls costing in local and international terms?

2; How much is it costing the telco per month just to have the VOIP user enabled? Phone number etc etc..

3; In terms of bandwidth, how much would be required for a high-quality low-latency national call?

4; How many UK-Based ISP’s are currently in the market, and have the successes been notable? Any stock readouts here would be superb 🙂

Thank you very much for your time 🙂