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When the LTE network deployment VOLTE, which of the following scenarios voice can also be solved through CSFB in? (Multiple choice)

When the LTE network deployment VOLTE, which of the following scenarios voice can also be solved through CSFB in? (Multiple choice)
A . IMS network guides user CSFB through parameter configuration
B . The VOLTE call flow is abnormal, and the terminal connects to the call through the CS network.
C . When an emergency call is made, the VOLTE user can dial the emergency number through CSF
E . Terminal autonomous CSFB

Answer: ABCD

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