SymmetricNAT and Janus

Does anyone know how Janus with NAT 1:1 setting is supporting the symmetricNAT without TURN in the way ?
Symmetric NAT is supposed to be unpassable NAT without TURN, but somehow Janus is able to do some tweak there , as candidate pairs cannot be matched is this type.
Because this type of NAT assigns a different external port for every different port at the Janus side.

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