Just sharing my thoughts here. I am thinking of once the phone did not answer after a period of time, call will go to voicemail (Unity), then voicemail will play greeting that says "the call is being transferred…", then you will be transferred to a Call Handler that transfers the call to your destination. Not sure if this is an appropriate solution as you need to configure each users with Call Handler to transfer their calls and any forwarding details will be done from Unity, not from Call Manager.
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