Hi Forasmith05
We can recommend using BT Broadband Voice which has the capability 2 Broadband Voice Lines, this service has features such as Find Me Follow Me, which allows you to be easily contacted by ringing several numbers, such as your mobile, home phone and office extension, when someone calls you. You can set up rules to control the numbers that are included and the order in which these numbers are called; you can have two or more numbers called at the same time
If you would like to keep your existing telephone number, you could port you line to BT Broadband Voice or have you number diverted to you broadband voice number.
To use this service you would need a broadband connection at both premises.
SC