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There are two types of media cards that can be used to provide additional DSP resources to the MG1000E. The Media Card 32 (MC32) and the Media Card 32 Security (MC32S) both provide 32 channels of DSP Resources to the system. The difference between the two is that the MC32S provides the addition of Secure Real-Time Protocol (SRTP). SRTP encrypts the IP media path to and from the DSP channels on the MC32S card. It also offers improved echo performance over the MC32.