Duplicate call prevention
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Sometimes, devices have poorly implemented SIP protocols and try to initiate the same call twice at the same time.
The "Duplicate call prevention" option is implemented to avoid such situation.
It kills both calls and prevents the malfunctioning device from dialing.
Allow duplicate Calls is available for Providers and Devices in the Edit window under Advanced settings.
Its default setting is No. If you are not sure what you are doing, leave it that way.