update for 504 re-register during invite, REF 14826

Wenpeng Songrequested to merge
14826-504-register into asterisk_chan_voicemngr_rdkb
  • retrieve information regarding 504-register status while 504 re-register happened.
  • skip playing tone and keep the dialed number and context if 504-register ongoing while the original session(INVITE session that got 504 with xml) hangup.
  • calling again if 504-register success
  • play congestion tone and reset the info that kept above(context and ext) if 504-register failed

Required: asterisk!315 (merged)

Edited by Wenpeng Song

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