QNAP VioStor NVR User Manual page 159

(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.
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