Hmm. How do they tell that you're no longer on hold though? I've waited in silence, listened to bad music and occasionally had the your call is important to us spiel when on hold. Not sure how you'd detect that it wasn't music or a prerecorded message?
My guess is that it's the agent on the other end that gets treated to the machine message, telling them to wait while they dial you. If LucyPhone were trying to detect when you were off hold, there wouldn't be enough time to call you between when they were able to detect the end of the hold and when the agent picks up (which are usually the same thing).
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