Telephone numbers Because Voice over IP has no geographical boundaries you can keep your telephone numbers even when you move into an entirely different area. You can also have multiple geographical numbers from different areas in the UK ringing on your system. This means that a company based in Reading can advertise an 0161 number locally in Manchester, an 0117 number in Bristol and an 01273 number in Brighton and have all the calls ringing in the office in Reading. FullDuplex has now set up partnerships outside of the UK, you can have calls from 38 countries worldwide ringing onto your VoIP for Business telephones. For more information, have a look at the web pages entitled International Numbers.