Internet protocol multimedia subsystem emergency calls for roaming user equipments

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United States of America Patent

PATENT NO 11917516
APP PUB NO 20210258759A1
SERIAL NO

17246796

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Abstract

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A method of operating a user equipment (“UE”) to handle an internet protocol multimedia subsystem (“IMS”) emergency call can include sending a session initiation protocol (“SIP”) REGISTER request relating to an emergency registration to a proxy call session control function (“P-CSCF”) of an IMS network. The method can further include, responsive to sending the SIP REGISTER request, receiving a response from the P-CSCF. The method can further include, responsive to receiving the response, performing an action based on the response.

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Patent Owner(s)

  • TELEFONAKTIEBOLAGET LM ERICSSON ( PUBL)

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fernandez, Alonso Susana Madrid, ES 84 1016
Keller, Ralf Würselen, DE 246 2370
Lindholm, Fredrik Tokyo, JP 118 2478
Sedlacek, Ivo Hovorcovice, CZ 74 799

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