System→ Alarm → Alarm → Howling (play siren if alarm is not answered)
N/A
1.14.4
alarm.x.howling_enable = VALIDVALUE
If this setting is enabled, the M56 handset will emit an alarm sound until it has established a call/intercom call/page with the alarm recipient.
where x = Alarm profile number (1-8)
0 (disabled), 1 (enabled)
0