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In the FTTB/C scenario, the ONU is connected to the phone as an AG device, and no sound failure when the SIP protocol is picked up. The possible cause is:

In the FTTB/C scenario, the ONU is connected to the phone as an AG device, and no sound failure when the SIP protocol is picked up. The possible cause is:
A . olt upper network has packet loss
B . The status of the MG interface on the ONU side is abnormal
C . Voice server failure
D . The route between ONU and IMS is unreachable

Answer: B

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