One button blind transfer


in a conference room there will be a polycomm ip700 and a Digium d40 or D70.

As this room is used by the executives it would be good to be able to have them be able to transfer a call from the Digium to the IP7000 with one button.

Is there a way to program a FreePbx with a Digium using a line key or a sidecar key to perform a one button blind transfer to the extension of the IP7000?

With the Nortel which is being replaced it was set up with the same extension on both and they are used to just placing the call on hold and picking it up on the Polycom. As this is not a option i was hoping that this could work.

Any help greatly appreciated.