In reading the instructions for using call forwarding, it says that I can forward calls to my voice mail by pressing the call fwd key and my voicemail key. On the M174, it does not appear that I have a "voice mail" key.. just a open vm and transfer vm. Does anybody know the feature code to the "voicemail" key so that when I want my calls to go straight to voicemail I can just press call fwd and the voicemail key??