In a multi-node centralized network, there is a central node with a U1981 deployed, and two branch nodes, one with a U1911 and the other with a U1960. After a call from SIP user A under U1911 to POTS user B under U1960 is connected, the path along which the RTP streams are transmitted is ().
- A<->U198K->U1960
- A<->U1960
- A<->B
- A<->U191K->U198K->U1960<->B
- A<->U1960<->B
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