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To block certain types of call, follow these steps:
1.
Check the type of call you want to block.
2.
Hit
Apply
.
To unblock a type of call, follow these steps:
1.
Uncheck the type of call you want to allow.
2.
Click on
Apply
.
17.4
Preferences
The Preferences tab lets you view and change some general settings for your phone line which you are
unlikely to want to change often.