J.1 General

23.1673GPPIP Multimedia Subsystem (IMS) emergency sessionsRelease 17TS

This annex includes additional clarifications when the IP-CAN corresponds to a WLAN access to EPC.

Both trusted WLAN access (S2a) and Untrusted WLAN access (S2b) to EPC for emergency sessions are supported.

NOTE: This annex only applies to EPC access using S2a or S2b.

The UE may issue an Emergency session over WLAN access to EPC only when 3GPP access for emergency call is not possible or available (e.g. no 3GPP coverage).

Further details on the procedures defined for WLAN access to EPC support of support emergency sessions are defined in TS 23.402 [29].