US Patent No. 11,116,018

EMERGENCY CALLS


Patent No. 11,116,018
Issue Date September 07, 2021
Title Emergency Calls
Inventorship Jan Hendrik Lucas Bakker, Fort Worth, TX (US)
Assignee BlackBerry Limited, Waterloo (CA)

Claim of US Patent No. 11,116,018


1. A method of a user equipment (UE), comprising:receiving, at the UE, an Extended Local Emergency Number List from a first Public Land Mobile Network (PLMN);
detecting, by the UE, an emergency number;
deriving, by the UE, a Uniform Resource Name (URN) from the Extended Local Emergency Number List, the URN associated with the emergency number;
detecting, at the UE, that the UE is attached to or registered with a second PLMN different from the first PLMN; and
in response to the detecting that the UE is attached to or registered with the second PLMN different from the first PLMN, including, by the UE, a particular Session Initiation Protocol (SIP) Uniform Resource Identifier (URI) in a Session Initiation Protocol (SIP) INVITE message.