Section: 4.3.12.11 Support of eCall Only Mode
Content: For service requirements for eCall only mode, refer to TS 22.101[ Service aspects; Service principles ]  [80]. A UE configured for eCall Only Mode shall remain in EMM-DEREGISTERED state, shall camp on a network cell when available but shall refrain from any Mobility Management or other signalling with the network. The UE may instigate Mobility Management and Connection Management procedures in order to establish, maintain and release an eCall Over IMS session or a session to any non-emergency MSISDN(s) or URI(s) configured in the UICC for test and/or terminal reconfiguration services. Following the release of either session, the UE starts a timer whose value depends on the type of session (i.e. whether eCall or a session to a non-emergency MSISDN or URI for test/reconfiguration). While the timer is running, the UE shall perform normal Mobility Management procedures and is permitted to respond to paging to accept and establish an incoming session (e.g. from an emergency centre, PSAP or HPLMN operator). When the timer expires, the UE shall perform a UE-initiated detach procedure if still attached and enter EMM-DEREGISTERED state. NOTE 1: An HPLMN operator can change the eCall Only Mode configuration state of a UE in the UICC. An HPLMN operator can also instead add, modify or remove a non-emergency MSISDN or URI in the UICC for test and/or terminal reconfiguration services. This can occur following a UE call to a non-emergency MSISDN or URI configured for reconfiguration. When the eCall Only Mode configuration is removed, the UE operates as a normal UE that can support eCall over IMS. NOTE 2: A test call and a reconfiguration call can be seen as normal (non-emergency) call by a serving PLMN and normal charging rules can apply depending on operator policy. NOTE 3: An MSISDN configured in the UICC for test and/or terminal reconfiguration services for eCall Over IMS can differ from an MSISDN configured in the UICC for test services for eCall over the CS domain. When attaching to EPS for E-UTRAN access, a UE configured for eCall Only Mode may indicate support for radio capabilities for IRAT Handover (for UTRAN) or SRVCC Handover (for GERAN), but shall not indicate support for IMS Voice over RATs other than E-UTRAN. NOTE 4: Access to the PS domain for a UE configured for eCall Only Mode is only supported by E-UTRAN in this version of the specification.