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Unless I've misunderstood your question :)
I guess if you get free local calls, it's a way of getting free internet access.
Kind of!
I know of a piece of hardware which will do this which was our old ISDN II router which had remote access via telephone (you needed a modem option).
It was by NetGear. I can't remember the model name for the life of me I'm afraid.
Have a look around - I'm sure there'll be something around that will do what you want. If you have a spare PC it would be pretty easy to build a Linux box with a modem in it that will do that for you.
TJ
www.hardwarecentral.com/hardwarecentral/reviews/1553/1/
I know this will do exactly what you want to do. You would need to configure it as your DHCP server though, so that your home PC gets allocated an office network IP addy when you dial in by modem. You'd have to make sure that your existing office network internet connection sharing system allows an external DHCP server to have control of IP allocations.
I'm sure you can find one second-hand on ebay or somewhere.
I've still got our old one kicking around if you want to make me an offer!
TJ