In a multi-node centralized network, there is a central node with a U1981 deployed and a branch node with a U1911 deployed. SIP user A under U1911 calls an external PSTN user through the branch node’s El trunk. After the call is connected, the path along which the RTP streams are transmitted is ().

In a multi-node centralized network, there is a central node with a U1981 deployed and a branch node with a U1911 deployed. SIP user A under U1911 calls an external PSTN user through the branch node’s El trunk. After the call is connected, the path along which the RTP streams are transmitted is ().
A . A<->U1981<->U1911
B . A<->U1981
C . A<->U1911
D . A<->U1911<->U1981<->U1911
E . A<->U1981

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Answer: C