Westermo MRD-3x0 - Manual (Page 54)

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3.5.2.2 Example: Default policy to Drop
To set the SMS Access Control for a default action of drop
and to specifically accept a number, refer to Figure 45 and
complete the following steps:
1. In the section titled SMS Access Control set the Default
policy Action to Drop.
2. In the section titled Add new SMS access control:
(a) Add a label for the new entry.
(b) Enter the phone number.
(c) Set the Action to Accept.
3. Click the Update button to save the changes.
4. Repeat the steps above to add further numbers.
When complete the page will include the number to be
accepted, as shown in Figure 46.
Figure 45: SMS Triggers accept entry.