Hello,

I think this option work only with Asterisk 1.8.X

On the Asterisk 1.8.X CHANGES files:

* Added 'R' option to app_queue. This option stops moh and indicates ringing to the caller when an Agent's phone is ringing. This can be used to indicate to the caller that their call is about to be picked up, which is nice when
  one has been on hold for an extened period of time.

Regards

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