After the VoIP user picks up the phone, he can hear the normal dial tone, but after dialing, the dial tone is not stopped. What are the possible reasons? (Multiple Choice)

After the VoIP user picks up the phone, he can hear the normal dial tone, but after dialing, the dial tone is not stopped. What are the possible reasons? (Multiple Choice)
A . The MGC did not issue signaling to stop dialing dial tone
B . A/μ mode settings of DSP Slave is inconsistent of User Boards
C . Adjacent user side slots small-nets are not removed
D . MG does not report off-hook signal correctly

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Answer: ABD