Whisper Prompts are what the agent hears just before they are connected to the calling party. It provides very brief information to the agent on something specific to that caller - like the caller’s name, a line of business, or their account standing, etc. Whisper Prompts are enabled for each Q by default. However, you'll need to assign a special QSkill in order to take advantage of them.
The whisper prompt is a Text-To-Speech (TTS) interpretation of the QSkill text value. To enable a skill as a Whisper Prompt, you'll need to add the prefix "wptts_" to the skill name. (e.g. "wptts_Platinum Member Q" would play a TTS prompt when the call is answered of "Platinum Member Q.")
Once you've added the appropriate skill with the "wptts_" prefix, you'll need to assign the skill to an interaction (just as you would a standard Q Skill) within the Logic Flow or Inbound Route.
For more information on assigning QSkills, please reference the Admin > Configuration> QSkills section of the Admin Guide.