Add whisper before connecting from IVR node

This user pretty much laid it out https://community.ringcentral.com/questions/98562/whisper-in-ivrcould-i-set-up-a-whisper-in-the-ivr.html

Wanted to make sure it was entered as an idea.

Our aim is to provide the best possible service, so knowing the context of the call before answering is very important.

Add a phrase to every end node of an IVR tree or concatenate phrases at each node as the user traversed the tree.