QNAP VS-2004L en - Manual (Page 206)

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(5) SMS
To allow the system administrator to receive an instant SMS alert when an event is
triggered, enter the SMS server settings. The default SMS service provider is
Clickatell. To add other SMS service providers, click ‘Add’ and enter the provider's
name and the URL template text.
Click ‘Select from the list’ to select an action setting which has been configured
before.
Note: Always follow the standard of the SMS service provider to receive the SMS
properly.