In a scenario where the AR provides the local regeneration function, a call fails. During the fault locating process, to identify the calling and called number information before and after the number change, obtain the debugging information of the ( ) module.

In a scenario where the AR provides the local regeneration function, a call fails. During the fault locating process, to identify the calling and called number information before and after the number change, obtain the debugging information of the ( ) module.
A . CCM
B . Innertrace
C . sipmsg
D . dss1

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Answer: A