mozilla-b2g/gaia — pull request #12081 by lissyx (2013-09-10 14:38:13+00:00)
Title: Bug 910267 - Add a busy tone when the callee is busy

Per cerfication requests we need to play a busy tone, not only display
the information to the user in a message. This commit adds a busy tone
playback. It also fixes the telephony helper tests.