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Content for  TS 23.231  Word version:  17.0.0

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6.2.2  Terminating Call Establishment For Iu Interface on IP with immediate MGW selectionp. 32

For IP transport over the IuCS the procedures in the present clause shall apply in addition to the SIP-I based Core Network side procedures described in clause 6.2.1.
For the access side termination, the exchange of IP addresses as defined in the clause 6.2.3 of TS 23.205 shall apply.
If the bearer transport is IP and IuUP mode is Support, the MGW shall use the source IP address and UDP Port of the IuUP Init packet received from the radio access network as the destination address for subsequent downlink packets.
The sequence is shown in Figure 6.2.2.1.
Copy of original 3GPP image for 3GPP TS 23.231, Fig. 6.2.2.1: Terminating Call Establishment for Iu on IP
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6.2.3  Terminating Call Establishment For A Interface user plane over IP with immediate MGW selectionp. 32

For A interface user plane over IP, the procedures in the present clause shall apply in addition to the SIP-I based Core Network side procedures described in clause 6.2.1.
For the access side termination, the exchange of IP addresses as defined in the clause 6.2.4 of TS 23.205 shall apply.
The sequence is shown in Figure 6.2.3.1.
Copy of original 3GPP image for 3GPP TS 23.231, Fig. 6.2.3.1: Terminating Call Establishment for A interface user plane IP
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