Patent ID: 9385863
Filing Date: 2016-07-05
CPC Classification: H04L,H04M,H04W

Claim Text:
1. A machine-readable storage device comprising instructions which, when executed by a processor, cause the processor to perform operations, the operations comprising: receiving a session initiation protocol register message sent from a communications device requesting authentication, the session initiation protocol register message including a public key infrastructure certificate associated with the communication device; determining a previous registration associated with the communications device, the previous registration registering the communications device to a multimedia subsystem network using the public key infrastructure certificate; determining a pre-registration associated with the communication device to a proxy call session control function without an additional authentication of the communication device based on the previous registration with the multimedia subsystem network; and sending a public key associated with the multimedia subsystem network to the communication device responsive to the pre-registration associated with the communication device.