I have/had this problem with a 8811 and this post was helpful, until it wasn't... I downloaded cmterm-88xx.11-7-1-17.zip, extracted, uploaded each file to TFTP on each server, restarted TFTP service, changed load for the problematic phone, Saved and ...

I have the same experience on current-firmware 8811s, and we have no intentions of using Simplified UI.  This is how I cleared the recent placed call history:  Applications > Admin settings > Reset Settings > All Settings > Reset.  The phone configur...