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First you pick up the handset, then...You either dial a 72X (i.e. 720, 721, 722, 723) code, followed by the extension number, or if the number you want to forward to is an outside number, you dial
and the outside number to forward to. And then hang up the handset.
To cancel call forwarding, you pick up the handset, dial 72, and hang up.
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I'm not sure what you mean by the 'top of the line keys' ?
This call forwarding depends upon what phone system your phone is connected to - since the phone system box is what does the forwarding, usually. Do you know what phone system your Panasonic VB phone station has?