The buttons on the left side are the feature keys and the buttons on the right side are the session keys. These are "programmable feature keys" on the left. The session keys are not programmable on the right side.
I agree, The 66XX and 99XX phones are far from impressive. Alot of things don't seem to work or are even possible that the 79XX phones can do easily. I'm struglling just trying to add the DND softkey to the 9951 phone, the 66XX phone you can't show the extension number unless you don't want to use the external mask. From what I can tell so far Cisco failed at designing these phones...
Q. What is the difference between the buttons on the left and those on the right of the screen?
A. Your phone has feature buttons on the left and call session buttons on the right. Use the feature buttons to access features (such as speed dial) or select a phone line. Use call session buttons to perform call-related tasks, such as making a new call, resuming a held call, or checking your voicemail.
You cannot program the session keys for other purposes, the feature keys can be defined for things such as mobility (left side keys).
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