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Hi - The VTech CM18445 is the Console and it is compatible with expansion unit models CM18045 and CM18245. The 3 units you installed will not communicate with each other as they are setup as a stand alone phone. For more details, please contact our Consumer Sales and Service Center between the hours of 9:00 AM and 4:00 PM Monday through Friday at 1-800-595-9511. Thank you, -VTech Support
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