F.3 Information Flows
23.1673GPPIP Multimedia Subsystem (IMS) emergency sessionsRelease 17TS
The informational flows for emergency calls over HRPD are provided in 3GPP2 X.S0060 [25].
Annex G (informative):
TEL‑URI provisioning considerations for IMS emergency call back
In order to support emergency call-back from the PSTN or CS Domain:
– For a single or multiple device subscription that contain both a SIP‑URI and TEL‑URI in at least one implicit registration set for each device (including subscriptions that share SIP-URIs and TEL‑URIs between devices), IMS emergency sessions can already be supported. If the user registers with a temporary public user identity (e.g. the subscription has a device containing a USIM) ensure that a TEL‑URI is provisioned in the same implicit registration set as the temporary public user identity.
– For a multiple device subscription that has TEL‑URIs for some devices but has one or more devices that are not assigned an implicit registration set containing a TEL‑URI (e.g. because these devices in the subscription are not allowed to use a TEL‑URI in normal originations), the existing TEL‑URIs in the subscription cannot be shared between all devices for the purposes of IMS emergency sessions.
Annex H (normative):
IMS emergency services using UTRAN, E-UTRAN and NG-RAN radio access network