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[Sebastien Bacher <seb128@xxxxxxxxxx>]

** Project changed: telephony-service => telephony-service (Ubuntu)

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https://bugs.launchpad.net/bugs/1341453

Title:
  No alert tone heard if network does not play it in-band

Status in ofono package in Ubuntu:
  In Progress
Status in telephony-service package in Ubuntu:
  Confirmed

Bug description:
  Test case:
   - Dial a voice call
   - Call starts ringing at the other end
   - Expecting to hear an alerting tone in my earpiece
   - But there is only silence

  This is a rare but valid "feature" in some commercial networks, for
  example Bouygues Telecom, France. The in-band audio connection is
  sometimes not yet set up in the alerting phase.

  The relevant technical specification piece, from 3GPP TS 24.008 sect.
  5.2.1.5 "Alerting": "an alerting indication should be given to the
  user. If the mobile station has not attached the user connection then
  the mobile station shall internally generate an alerting indication".

  The Android RIL API supports this feature via notification
  "RIL_UNSOL_RINGBACK_TONE",
  http://androidxref.com/4.2.2_r1/xref/hardware/ril/include/telephony/ril.h#3717
  . Ubuntu should listen to this notification and generate the alerting
  tone appropriately.

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