Could someone please tell me how to change the main greeting on a DX80 with internal VM. In the manual it says to dial F#0 and the password scroll to auto attendant, tenant grp 1 and press play to hear the current green ting and record to record the new. The problem is when I press play or record all I get is two short rings on the phone. It doesn't play the old or prompt me to record the new. If I dial the VM number (157), I hear the greeting. How do I find out where it is recorded. Thanks.