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UCM6xxx Emergency Calls Guide
Scenario for PSTN Lines
Assuming that the main SIP trunk becomes unreachable and both PSTN lines where occupied with normal
calls and suddenly an urgency situation occurred and user with extension 2018 dialed 911.
Figure 9: Active Calls
Once the user dialed the 911 emergency call, the UCM will drop one of the calls in order to give priority to
the emergency call as well as sending notification to the other users as seen on the screenshot below
Figure 10: Active Calls 2
