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X IMS 3GPP PS Data Off Service Accessibility  X.1 General  X.2 UE Behaviour  X.2.1 UE 3GPP PS Data Off Status Reporting  X.2.2 UE Provisioning  X.2.3 UE Enforcement of 3GPP SIP-Based 3GPP PS Data Off Exempt Services  X.3 Network Behaviour  X.3.1 Network Update to 3GPP PS Data Off Exempted Services  X.3.2 Network Enforcement of SIP-Based 3GPP PS Data Off Exempted Services 
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X (Normative)  IMS 3GPP PS Data Off Service Accessibility |R14|  p. 327

X.1  General  p. 327

3GPP PS Data Off is an optional feature. When activated by the user and when the network supports the feature, this feature allows control of the IMS services and more broadly SIP based services using the IMS framework that the user is allowed to access, for both originating and terminating sessions.
The list of 3GPP PS Data Off Exempted Services is configured by the HPLMN in the UE and in the network for enforcement. The list of SIP based service can include any one or any combination of the following services:
  • MMTel Voice;
  • SMS over IMS;
  • MMTel Video;
  • USSI;
  • Particular IMS Services not defined by 3GPP, where each such IMS service is identified by an IMS communication service identifier.
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X.2  UE Behaviour  p. 327

X.2.1  UE 3GPP PS Data Off Status Reporting  p. 327

The UE shall include an indication that depicts the 3GPP PS Data Off status (active/inactive) at initial IMS registration, and subsequent to that, any time the end user changes the 3GPP PS Data Off status in a (re-)REGISTER request. In all these registration requests the UE shall register the SIP based services that are configured in the UE.
The UE and the network shall ensure that the proper services are enforced in accordance with the 3GPP PS Data Off status.
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X.2.2  UE Provisioning  p. 327

The UE may be provisoned by HPLMN with up to two enumerated lists of SIP-based services that are 3GPP PS Data Off exempted either via Device Management or in the UICC, one list is valid for the UEs camping in the home PLMN and the other list is valid for any VPLMN the UE is roaming in. When the UE is configured only with a single list, without an indication to which PLMNs the list is applicable, then this list is valid for the home PLMN and any PLMN the UE is roaming in.
A UE provisioned with an updated list shall enforce the updated list immediately.
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X.2.3  UE Enforcement of 3GPP SIP-Based 3GPP PS Data Off Exempt Services  p. 327

When the UE changes its 3GPP PS Data Off status from inactive to active, the UE shall ensure that only the 3GPP PS Data Off Exempted Services in the provisioned list are allowed to be transported, and the corresponding IP uplink packets shall be sent accordingly as follows:
  • The UE shall prevent sending of UE-originating SIP requests which are for services other than the 3GPP PS Data Off Exempted Services configured in the UE via device management or in the UICC.
  • The UE shall prevent sending of SDP offers and SDP answers with media streams for the media types other than those related to the 3GPP PS Data Off Exempted Services configured via device management or in the UICC.
  • A UE shall immediately stop sending any media packets and shall terminate all ongoing sessions for all SIP-based services that are not 3GPP PS Data Off Exempt.
  • A UE provisioned with an updated list shall enforce the updated list immediately. To that effect, the UE shall immediately stop sending any media packets and terminate all ongoing SIP-based sessions handling the 3GPP PS Data Off Exempt Service(s) removed from the list.
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X.3  Network Behaviour  p. 328

X.3.1  Network Update to 3GPP PS Data Off Exempted Services  p. 328

The HPLMN network shall provision in the UE either via Device Management or in the UICC the lists of 3GPP PS Data Off Exempt Services. Up to two lists are provisioned in the UE for that purpose: one list is used when the UE is at home, while the second list is used when the UE is roaming in any visited PLMN.
The information shall be provisioned in the UE prior to enabling the 3GPP PS Data Off Service. Any change to either one or both lists shall immediately be sent to the UE for enforcement.

X.3.2  Network Enforcement of SIP-Based 3GPP PS Data Off Exempted Services  p. 328

Application Servers implementing the SIP-based services shall enforce the SIP based 3GPP PS Data Off Exempted services for all UEs.
Each Application Server shall be configured with up to two lists of 3GPP PS Data Off Exempt Services, one list for non-roaming users, and the other list for users roaming in the various VPLMNs with whom roaming agreements exist.
The AS shall become aware of the UE 3GPP Data Off status (active/inactive) at IMS (re-)Registration through third party registration. If the UE has changed its 3GPP PS Data Off status from inactive to active, the AS shall ensure that only SIP-based services which are part of the SIP-based 3GPP PS Data Off Exempt Services are permitted.
If the UE has changed its 3GPP PS Data Off status from active to inactive, the AS shall also let through the terminating requests to the UE for services that were not Data Off exempt.
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