The ability to turn on / turn off "Lateral extension dialing" within IVRs
We have cases from Customer's who do not like the fact that when callers reach a UC IVR menu they can dial extension numbers as well as the configured "Key presses" within the IVR. The Customers believe that they should be able to turn off this extension dialing so that only the configured key presses work and route calls.

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Justin commented
This is such a basic PBX feature, it needs to be implemented. Some customers don't want callers to be able to dial an extension from the IVR menu.
To add, when you do implement this feature, allow limiting extension dialing to a specific Site as well.
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Jon commented
We have had patients accidentally dialed a "page all" 4-dgit extension a couple times. Sensitive and/or disturbing things were said while they were connected and it was basically broadcasted throughout the entire building.