Hi, Does anyone know how to configure the 301D to function with the R buttons on handsets for call-transferring? Call transferring does function on the supported handset by the menu>external call... But not all Siemens handsets support it via the menu. It would be nice if the R button could be used. The latest firmware of the 301D has some settings for the R button, but the 3CX does not react to whatever I try. Please help! Thanks!!