QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 175)

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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: You will not be able to receive the SMS properly if the URL template text
entered does not follow your SMS service provider’s standard.