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Content for  TS 23.501  Word version:  18.5.0

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8.2.4 Control Plane for untrusted non 3GPP Access 
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8.2.4  Control Plane for untrusted non 3GPP Access  p. 601

Reproduction of 3GPP TS 23.501, Fig. 8.2.4-1: Control Plane before the signalling IPsec SA is established between UE and N3IWF
Figure 8.2.4-1: Control Plane before the signalling IPsec SA is established between UE and N3IWF
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Reproduction of 3GPP TS 23.501, Fig. 8.2.4-2: Control Plane after the signalling IPsec SA is established between UE and N3IWF
Figure 8.2.4-2: Control Plane after the signalling IPsec SA is established between UE and N3IWF
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Large NAS messages may be fragmented by the "inner IP" layer or by TCP.
Reproduction of 3GPP TS 23.501, Fig. 8.2.4-3: Control Plane for establishment of user-plane via N3IWF
Figure 8.2.4-3: Control Plane for establishment of user-plane via N3IWF
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In the above Figure 8.2.4-1, Figure 8.2.4-2 and Figure 8.2.4-3, the UDP protocol may be used between the UE and N3IWF to enable NAT traversal for IKEv2 and IPsec traffic.
The "signalling IPsec SA" is defined in clause 4.12.2 of TS 23.502.
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