Chapter 3: Operate the system
64 SB-Safety Voice
is automatically transferred to the active phone line. If an incoming call is
refused by its priority, the caller hears a busy tone.
Cabin calls
The cabin user interface has an Ethernet connection for Internet services
and VoIP service via the built-in telephone exchange in the SBU. Incoming
cabin calls are routed to the VoIP headset or handset, if present. If no HS is
present for accepting incoming cabin calls, the call is rejected with a busy
tone. Outgoing calls from the cabin i.e. from the VoIP headset or handset
are placed as a priority level 4 call. A cabin call is preempted by any call to or
from the cockpit.
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