correction for busy tone playing

Wenpeng Songrequested to merge
busy-tone-playing-update into devel
  • Add congestion tone to 404(AST_CAUSE_UNALLOCATED) and general indication(AST_CAUSE_INTERWORKING) for response 400-500.
  • Add CALLING to the condition of the fallback in case of a status like 404 which does not even reach the RINGBACK.

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