公开(公告)号：US11102351B2

公开(公告)日：2021-08-24

申请号：US16792558

申请日：2020-02-17

Applicant: Apple Inc.

Inventor： Alexandre Saso Stojanovski ,  Frederic Joly ,  Jerome Parron

IPC: H04M3/51 ,  H04L29/06

Abstract: IMS emergency call routing techniques are described. In one embodiment, for example, an apparatus may comprise at least one memory and logic for a P-CSCF node, at least a portion of the logic comprised in circuitry coupled to the at least one memory, the logic to cause the P-CSCF node to receive an SIP INVITE message from a roaming UE, the SIP INVITE message associated with an attempt to place an emergency call via an unauthenticated IMS session, the logic to cause the P-CSCF node to obtain a PSAP callback number for the UE from a PCRF node via an Rx interface, identify a PSAP callback parameter for the UE based on the PSAP callback number, insert the PSAP callback parameter into the SIP INVITE message, and forward the SIP INVITE message to a PSAP. Other embodiments are described and claimed.