7 Information element contents

29.2283GPPIP Multimedia (IM) Subsystem Cx and Dx InterfacesRelease 17Signalling flows and message contentsTS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

7.1 Visited Network Identifier

This information element contains the domain name of the visited network.

7.2 Public User Identity

This information element contains the Public User Identity. For definition of a Public User Identity, see TS 23.003 [17].

When GPRS-IMS-Bundled Authentication (GIBA) is used, a Temporary Public User Identity is derived from the IMSI used for bearer network access according to the rules in TS 23.003 [17].

7.2a Public Service Identity

This information element contains a Public Service Identity (PSI) that is hosted by an application server. For definition of a PSI, see TS 23.003 [17].

7.2b Wildcarded Public Identity

This information element contains a Wildcarded PSI that is hosted by an application server or a Wildcarded Public User Identity. For definition of a Wildcarded PSI and a Wildcarded Public User Identity, see TS 23.003 [17].

7.2c Void

7.3 Private User Identity

This information element contains the Private User Identity. For definition of a Private User Identity, see TS 23.003 [17].

When GPRS-IMS-Bundled Authentication (GIBA) is used, the Private User Identity is derived from the IMSI as specified in TS 33.203 [3].

7.3a Private Service Identity

This information element contains the Private Service Identity. For definition of a Private Service Identity, see TS 23.003 [17].

7.4 S-CSCF Name

This information element contains the S-CSCF Name of the S-CSCF assigned to an IMS Subscription. For definition of a S-CSCF Name, see TS 23.008 [18].

7.4a AS Name

This information element contains the AS Name of the AS hosting a Public Service Identity. For definition of AS Name, see TS 23.008 [18].

7.5 S-CSCF Capabilities

This information element carries information to assist the I-CSCF during the process of selecting an S-CSCF for a certain IMS Subscription.

7.6 Result

This information element contains result of an operation. See TS 29.229 [5] for the possible values.

7.7 User Profile

This information element contains the user profile in XML format. The user profile XML shall be valid against the user profile XML schema defined in Annex E.

Annex B specifies the UML logical model of the user profile downloaded via the Cx interface.

Annex D contains and informative, high level representation, of the wire representation of user profile data.

7.8 Server Assignment Type

Indicates the type of server assignment. See TS 29.229 [5] for the list of existing values.

7.9 Authentication Data

This information element is composed of the following sub-elements.

7.9.1 Item Number

This information element indicates the order in which the authentication vectors are to be consumed. See TS 29.229 [5] for coding details.

7.9.2 Authentication Scheme

This information element contains the authentication scheme, which is used to encode the authentication parameters. See TS 29.229 [5] for a list of values.

7.9.3 Authentication Information

This information element is used to convey the challenge and authentication token used during the authentication procedure, see TS 33.203 [3] for more information. See TS 29.229 [5] for coding details.

7.9.4 Authorization Information

This information element is used, in an authentication request, to indicate a failure of synchronization. In a response, it is used to convey the expected response to the challenge used to authenticate the user, see TS 33.203 [3] for more information. See TS 29.229 [5] for coding details.

7.9.5 Confidentiality Key

This information element contains the confidentiality key, see TS 33.203 [3] for more information. See TS 29.229 [5] for coding details.

7.9.6 Integrity Key

This information element contains the integrity key, see TS 33.203 [3] for more information. See TS 29.229 [5] for coding details.

7.9.7 Authentication Context

his information element contains authentication-related information relevant for performing the authentication but that is not part of the SIP authentication headers. Some mechanisms (e.g. PGP, digest with quality of protection set to "auth-int" defined in IETF RFC 7616 [33], digest with predictive nonces or sip access digest) request that part or the whole SIP request (e.g. the SIP method) is passed to the entity performing the authentication. In such cases the SIPAuthentication-Context AVP shall be carrying such information.

See TS 29.229 [5] for coding details.

7.9.8 Digest Authenticate

This information element is composed of the following sub-elements.

7.9.8.1 Digest Realm

This information element is part of the Digest authentication challenge, and corresponds to the Realm parameter as defined in IETF RFC 3261 [11]. This information element is used to convey the Realm to the S-CSCF during the SIP Digest authentication procedure. See TS 29.229 [5] for coding details.

7.9.8.2 Void

7.9.8.3 Digest Algorithm

This information element is part of the Digest authentication challenge, defined in IETF RFC 7616 [33]. See TS 29.229 [5] for coding details.

7.9.8.4 Digest QoP

This information element is part of the Digest authentication challenge, defined in IETF RFC 7616 [33]. It provides the Quality of Protection indication and has an effect on the digest computation. See TS 29.229 [5] for coding details.

7.9.8.5 Digest HA1

This information element is part of the Digest authentication challenge, defined in IETF RFC 7616 [33]. See TS 29.229 [5] for coding details.

7.9.8.6 Alternate Digest Algorithm

This information element is part of the Digest authentication challenge, defined in IETF RFC 7616 [33]. See TS 29.229 [5] for coding details.

7.9.8.7 Alternate Digest HA1

This information element is part of the Digest authentication challenge, defined in IETF RFC 7616 [33]. See TS 29.229 [5] for coding details.

7.9.9 Line Identifier

This information element contains the line identifier of the user’s network termination. See TS 29.229 [5] for coding details.

7.9.10 Framed IP Address

See TS 29.229 [5] for more information.

7.9.11 Framed IPv6 Prefix

See TS 29.229 [5] for more information.

7.9.12 Framed Interface Id

See TS 29.229 [5] for more information.

7.10 Number Authentication Items

This information element contains the number of authentication vectors requested or delivered.

7.11 Reason for de-registration

This information element contains the reason for a de-registration procedure.

7.12 Charging information

Addresses of the charging functions. See TS 29.229 [5].

7.13 Routing information

Information to route requests.

7.14 Type of authorization

Type of authorization requested by the I-CSCF. See TS 29.229 [5] for a list of values.

7.15 Void

Void

7.16 User Data Already Available

This information element indicates to the HSS if the user profile is already available in the S-CSCF. See TS 29.229 [5] for a list of values.

7.17 Associated Private Identities

This information element indicates to the S-CSCF the Private Identities, which belong to the same IMS Subscription as the Private Identity received in the request command. See TS 29.229 [5].

7.18 Originating-Request

This information element indicates to the HSS that the request is related to an originating SIP message. See 3GPP 29.229 [5].

7.19 User Authorization Request Flags

This information element carries the following indication (see 3GPP 29.229 [5] for coding details):

– IMS Emergency Registration.

7.20 Loose-Route Indication

This information element indicates to the S-CSCF that the loose-route mechanism shall be applied to the public identities contained in the user profile received from the HSS. See TS 29.229 [5]. This information is static data for the duration of the subscription or the validity of the IMS identity. Modification of this data result in Network Initiated Deregistration (SERVER_CHANGE); see clause 6.1.3.1.

7.21 S-CSCF Restoration Information

This information element contains information for the S-CSCF to handle traffic for a registered user. It is associated with the Private User Identity and the Implicit Registration Set that is affected by the SAR request. See TS 29.229 [5] for the contents of this information element.

7.22 Associated Registered Private Identities

This information element indicates to the S-CSCF the Registered Private Identities, which were registered with the Public Identity received in the request command. See TS 29.229 [5].

7.23 Multiple Registration Indication

This information element indicates to the HSS that this is related to a multiple registration. See TS 29.229 [5].

7.24 Session-Priority

This information element indicates the session’s priority level to the HSS. See TS 29.229 [5].

7.25 Identities with Emergency Registration

This information element indicates to the HSS a list of pairs of Private / Public Identities that are emergency registered. See TS 29.229 [5].

7.26 Priviledged-Sender Indication

This information element indicates to the S-CSCF that the Private User Identity shall be considered as a priviledged sender, as described in TS 24.229 [8].

7.27 LIA Flags

This information element carries the following indications. See TS 29.229 [5] for coding details.

– PSI Direct Routing Indication

7.28 Server Assignment Request Flags

This information element carries the following indication (see 3GPP 29.229 [5] for coding details):

– P-CSCF Restoration Indication

7.29 Allowed WAF and/or WWSF Identities

Addresses of the WebRTC Authentication Functions and/or WebRTC Web Server Functions allowed for a subscription. See TS 33.203 [3].

7.30 RTR Flags

This information element carries the following indications. See TS 29.229 [5] for coding details.

– Reference Location Information change

7.31 Failed-PCSCF

This information element indicates to the HSS the address of a failed P-CSCF, as detected by the S-CSCF.