In a remote disaster recovery scenario, when the main node (U1981) fails, POTS user A of a branch node (the branch site device is U1911) makes an outbound call to local PSTN user B through the branch node, and the SIP signaling of the call passes through network element is?

In a remote disaster recovery scenario, when the main node (U1981) fails, POTS user A of a branch node (the branch site device is U1911) makes an outbound call to local PSTN user B through the branch node, and the SIP signaling of the call passes through network element is?
A . U1911-> Standby U1981->U1911
B . Standby U1981->U1911
C . U1911
D . U1911->Main U1981->Standby U1981->U1911

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Answer: A