db-schema/db_scripts/diff/15809.up

USE provisioning;
SET autocommit=0;

SELECT `id` FROM `voip_preferences`
  WHERE attribute='announce_conn_type'
  INTO @pref_id;

# properly set NULL value for domain default of subscriber
UPDATE `voip_preferences_enum`
  SET value = NULL
  WHERE preference_id = @pref_id AND usr_pref = 1 AND label = 'use domain default';

# additionally update description for the preference 'announce_conn_type'
UPDATE `voip_preferences`
  SET description = "Define what type of connection to use in case of pre-announcements (such as office-hours, early rejects, pre-recording announcement etc.). If set to 'early' the announcement is played with early media (183). If set to 'established' the announcement is played using established connection (200OK)."
  WHERE id = @pref_id;

COMMIT;