3gpp 3gpp ts 33203 v12670 2014 0609 115 release 12

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3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 115 Release 12
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When a PDP context has been set up successfully, the UE sends a SIP REGISTER. As the UE supports fully compliant IMS security, the UE attempts to register using the procedures of fully compliant IMS security. The P-CSCF does not support fully compliant IMS security, and returns an indication back to the UE that the network does not support fully compliant IMS security. The UE sends a new REGISTER, this time according to the procedures of GIBA security. The REGISTER message contains the IP address and the IMPU of the UE. The GGSN checks that the IP address provided in the REGISTER message matches the IP address allocated to the UE when the PDP context was set up. When the IP address has been verified, the GGSN forwards the REGISTER message to the P-CSCF. The P-CSCF checks the source IP address against the IP address in the Via header of the REGISTER message. If the source IP address differs from the IP address in the Via header, the P-CSCF adds the source IP address to a received parameter in the Via header. The P-CSCF then forwards the REGISTER to the S-CSCF. The S-CSCF contacts the HSS and indicates that GIBA is used to authenticate the UE. The HSS returns the stored IP address to the S-CSCF. The S-CSCF then checks the IP address returned by the HSS against the IP address obtained in the REGISTER message (if present, the received by parameter shall be used). The S-CSCF sends a message to the HSS, informing that this S-CSCF is going to serve the UE, and the HSS responds which a message providing information that the S-CSCF needs for serving the UE. The S-CSCF returns a SIP 200 OK to the UE, indicating that the registration is successfully completed. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 116 Release 12
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UE 1 GGSN P-CSCF S-CSCF PDP Context Activation Request PDP Context Activation Accept (PDP Address Allocated: ff.ee.dd.cc) RADIUS/ HSS Accounting Request Start (PDP Address Allocated – ff.ee.dd.cc, + MSISDN+IMSI) Accounting Request Answer SIP: 420 Bad Extension GGSN checks for IP address spoofing Check source IP address against SIP "via" field SIP REGISTER (via: "sent-by" - ff.ee.dd.cc "received" – ff.ee.dd.cc) Cx MAR (public user id of UE1) Cx-MAA (IP Address stored ff.ee.dd.cc) Check "received" IP address against HSS stored IP address SIP: 200 OK GGSN checks for IP address spoofing SIP REGISTER (via: "sent-by" - ff.ee.dd.cc) IP src: ff.ee.dd.cc Map public user id to MSISDN or IMSI to retrieve associated IP address SIP REGISTER (Rel5 compliant) IP src: ff.ee.dd.cc SIP REGISTER (via: "sent-by" - ff.ee.dd.cc) IP src: ff.ee.dd.cc SIP REGISTER (Rel5 compliant) IP src: ff.ee.dd.cc Cx-SAR Cx-SAA Figure T.3: Message sequence for GIBA security showing interworking case where UE supports both fully compliant IMS security and GIBA security and network supports GIBA security only 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 117 Release 12
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Annex U (normative): Trusted Node Authentication (TNA) U.1 Overview The main objectives and requirements on Trusted Node Authentication is that it shall be possible to gain access to IMS
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