The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 2026
Filed:
Oct. 12, 2021
Apple Inc., Cupertino, CA (US);
Shashanka Totadamane Ramappa, Shivamogga, IN;
Krisztian Kiss, Rancho Santa Fe, CA (US);
Madhusudhan Cheripally, Bengaluru, IN;
Michael Lee, San Diego, CA (US);
Pradeep Pangi, Bengaluru, IN;
Rajkumar Krishnaperumal, Bengaluru, IN;
Sridhar Prakasam, Fremont, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
A technique for establishing a voice call including receiving an indication that the first wireless system supports emergency service fallback, receiving an indication to establish an emergency voice call, transmitting an emergency service request to the first wireless system, determining that an unexpected error has occurred, selecting a second wireless system based on the determination that the unexpected error has occurred, and connecting to the second wireless system to complete the emergency voice call. Additionally, a technique for cancelling a voice call including receiving an indication that the first wireless system supports emergency service fallback, receiving an indication to establish an emergency voice call, transmitting an emergency service request to the first wireless system, receiving an indication to cancel the emergency voice call, and cancelling a connection to a second wireless system.