3GPP 23.501 v20.2.0 — the document's own text
5.26.2.2 Routing
Taught in 27. Overload, energy, deployment and the rest (The 5G system architecture, in depth).
The following description applies to all the Configuration Transfer messages used for the exchange of the transparent container.
The source RAN node sends a message to its core network node including the source and destination addresses. The AMF uses the destination address to route the message to the correct AMF via the N14 interface.
The AMF connected to the destination RAN node decides which RAN node to send the message to, based on the destination address.