The short answer to that question is yes you can keep your current numbers. Moving numbers from one provider to another is called number 'porting'. All you need to do is tell us which numbers you want to keep and we will do the rest.
This will be the number that is used in various options as the multiplier. It will determine how many IP phones you will need, how many ethernet points in your office, how many switches in your local area network.
Connectivity comes in various sizes and costs. In the following pages we have tried to put the various options available to you in order of costs based on the current UK market.