I have a licensed FOP2 2.25 running on Asterisk 1.8.8.0 and FreePBX 2.9.0.7. I thought the "Transfer to voicemail" button was linked to the "mailbox=" returned by the "autoconfig-buttons-freepbx.sh" script. For some reason, some extensions with voicemail get the "Transfer to voicemail" button disabled and some others without voicemail get this button enabled. This is really annoying for the receptionist since she cannot transfert some calls to the voicemail even even though thay have one.
Thanks
Daniel