Add music_on_hold handle.

db_scripts/diff/9188.down

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+USE provisioning;
+DELETE FROM voip_sound_handles WHERE name = 'music_on_hold';

db_scripts/diff/9188.up

@@ -0,0 +1,2 @@
+USE provisioning;
+INSERT INTO voip_sound_handles (name) VALUES ('music_on_hold');