Which of the following descriptions about the internal bus and hardware modules of the U1900 system is incorrect?

Which of the following descriptions about the internal bus and hardware modules of the U1900 system is incorrect?
A . The main function of the main control module of the U1911 system is broadband protocol analysis, calling and resource control.
B . The U1981 system bus includes SM-BUS, PM-BUS, RS232, IP-BUS and TDM-BUS.
C . The main functions of the U1900 system MTU module include sound playback, provision of voice venue resources, TDM to IP packet conversion, fax protocol conversion, digit collection and A/D conversion, etc.
D . The U1960 system hardware module includes the main control module SCU, the media resource module MTU, the relay module MTU/OSU and the analog user module ASI/OSU.

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Answer: C