Cisco phones with no iDivert

[jthomas.tw]

We are using the Cisco 7941s and they are mostly functioning as we wish. Except we are unable to iDivert or Decline calls (either direct or queue calls) to voicemail (or back to the queue). I've looked over the cisco_softkey.xml file and it seems complete (from what I can tell), but they only options offered are Answer and CFwdAll when there is a call incoming. We are using the 8.5.4S firmware for the phones.