hi, during a call made with att_xfer, you can resume the user A on ring? Let me explain better, with bind_meta_app and att_xfer can do this: during a bridge if B dials *1 (for example), A is parked and B can call C. After C to answer, B can to dial # and return in conversation with A. B could resume A while is calling C (for example because I noticed that I've dialed an incorrect number)?
I tried with execute_on_ring, but without result. Any ideas? 
Thank you and good job to all.
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Rocco Lucente