Is there a way to see a call coming in on an incoming route and see the "Line as Buy" when some one picks up, that is to see the busy "Route" ?

I have sen this

http://www.smallbusinesstech.net/more-complicated-instructions/freepbx/how-to-enable-blf-busy-lamp-field-with-attendant-on-freepbx-with-polycom-phones

But I don't think that is what I want...