Transfer to cell phone T46G

[AndyInNYC]

I'm setting up my T46 DSS keys for my needs.
I have a freepbx/asterisk box which runs the system and a T46G on the desk and a wireless phone connected through a Digium card.

I'd like to be able to transfer a call from the desk phone to either the other extension so I can walk around or to the cell so I can leave and continue the call.

I have a DSS key set to Transfer, 100, 'Cordless' which correctly transfers the call to extension 100.

I'm trying to set button two (via web page) to transfer to '18005551212' and I can't make it work.

If I press the TRANSFER button on the phone during the call and at the dial tone press 18005551212 and then TRANSFER again, the call rings to the cell.

So, what do I need to wrap my head around to get this to work as a single step on Line Key2?

I'd rather not create misc extensions, etc. in freepbx and handle it that way if possible.

Andrew