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Content for  TS 29.235  Word version:  18.0.0

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5  Interworking between a SIP-I based circuit-switched core network and an ISUP based networkp. 34

5.1  Reference Modelp. 34

5.2  Control Plane Interworkingp. 34

5.3  Signalling Interworking of a Call from the ISUP based network towards the SIP-I based circuit-switched core networkp. 36

5.4  Signalling Interworking of a Call from SIP-I based circuit-switched core network towards the ISUP based networkp. 37

5.5  Supplementary servicesp. 38

5.6  User Plane Interworkingp. 39

5.6.1  Generalp. 39

5.6.2  DTMFp. 39

5.7  Example Call flowsp. 40


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