Mitel 5224 IP Phone - Manual (Page 20)

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To make an Emergency Call using the Line Interface Module line, when
the IP connection has failed:
1. Lift the handset.
2. Press the Line Interface Module key that you have programmed.
The set indicates IP FAIL: ANALOG CALL.
3. Dial your Local Emergency Number.
EMERGENCY CALLS WHEN EMERGENCY CALL ROUTING
PROGRAMMED
Note: This procedure is in addition to the methods described above.
To make an Emergency Call if Emergency Call Routing is programmed:
1. Lift the handset.
2. Dial your Local Emergency Number (911 or equivalent).
For more information on using the Line Interface Module line, refer to Using
the Line Interface Module.