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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