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Hi - The VTech CM18045 expansion handset does not have a setting to block incoming calls. Instead, you can set the ring group on the CM18445 to specify which extensions ring and display the caller ID information when there is incoming call on a certain telephone line. please contact our Consumer Sales and Service Center between the hours of 9:00 AM and 5:00 PM Monday through Friday at 1-800-595-9511 for assistance. Thank you, -VTech Support
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