At&t Intellectual Property I, LP

Mazen Aladwin

Mohamed Khalil

Karl J Schlieber

Arun K Chatterjee

A method includes receiving a first secured registration request message from user equipment at a registration server in an Internet Protocol multimedia subsystem network, the first secured registration request message being secured using a first security protocol, determining at the registration server that the first secured registration request message cannot be decoded using the first security protocol, sending a message from the registration server to the user equipment proposing a second security protocol, and receiving a second secured registration request message from the user equipment at the registration server, the second secured registration request message being secured using the second security protocol.

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Sammamish, WA, United States of America

Mazen Aladwin