"Panasonic KX-NCPS01, The Panasonic KX-NCPS01 is a SD memory card for VoIP encryption
It encrypts the voice packets providing a secure IP voice communications over the network using KX-NT300 series telephones. KX-NCPS01 Features: SD Memory Card for VoIP Encryption, Encrypts Voice Packets to Provide a Secure IP Voice Communications Over the Network, Will Not Work Without Phone System: Panasonic KX-NCP500 or KX-NCP1000"
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