Operation and Maintenance
210
Aastra 470 as of R1.2
syd-0337/1.2 – R1.2 – 11.2011
The following principles govern the way event messages are signalled to an exter-
nal signal destination:
• Individual event messages are not signalled if they occur at short intervals. The
event messages are stored temporarily for 5 minutes and then sent together to
the external signal destination.
• If over a period of one hour an attempt is made unsuccessfully to send the event
messages to the external signal destination, the signalling period is extended
from 5 minutes to 4 hours. As soon as the event messages are successfully out-
put at the external signal destination, the time period is reset to 5 minutes.
• If over a period of 1 hour an attempt is made unsuccessfully to send an event
message to an external signal destination, the number of dialling attempts is re-
duced from 5 to 2. As soon as an event message has been successfully sent, the
number of dialling attempts is increased to 5 again.
• If the attempt to send an event message to an external signal destination was
unsuccessful, the system will generate the event message
External event mes-
sage destination missing
".
Note:
Event tables and signal destinations should be set in such a way that
the event message
External event message destination missing
is sig-
nalled immediately to any signal destination still available.
Routing an external signal destination
The following points are to be taken into account when specifying the routing to
external signal destinations:
• If the external signal destination is dialled up via an exchange access prefix fol-
lowed by the call number, the call will be routed via route 3. To use a different
route, you need to configure a route selection.
• Digit barring for external calls and printer faults (in the case of call logging) do
not affect outgoing event messages.
Configuring external signal destinations
If a system sends an event message, the event message opens a PPP communica-
tion channel via the public network from the communication server to a Terminal
Adapter, connected either directly to a PC with the System Event Manager (SEM)
software program or indirectly via a LAN / WAN (ISDN gateway). Once the event
message has been confirmed, the system clears down the PPP connection.