passing dtmf rpt-event packet directly for 2-way call.
Add a new frame type AST_FRAME_DTMF_BYPASS
that used by chan-voicemngr which will forward the dtmf rtp-event packet directly for 2-way call when dtmf_mode is rfc4733.
Edited by Wenpeng Song
Add a new frame type AST_FRAME_DTMF_BYPASS
that used by chan-voicemngr which will forward the dtmf rtp-event packet directly for 2-way call when dtmf_mode is rfc4733.