name: UE
full_form: User Equipment
context: met, the call is re-invited by the CDIV AS to UE C which is pre-assigned by user B. If SDES is used, UE A includes a key K1 in the SIP message, the AS sends re-invite SIP message which includes K1 to the UE C, thus UE C knows now SDES method is used and it will learn this is a CVID call by the âCAUSEâ value, the usage and the specification of the CAUSE parameter refers to RFC 4458 and TS 24.604. Then UE C generates a second key K2 and a MOD, it generates new K1â based on K1 and MOD, and responds with a SIP message including K2 and MOD, when UE A receives the SIP message including K2 and OMD, UE A will generate new K1â based on K1 and MOD the same way as UE C. Thus the communication between UE A and UE C is protected by these two keys, i.e. UE A uses K1â to protect the media sent from UE A to UE C, UE C uses K2 to protect the media sent from UE C to UE A. If a call is diverted more than once, when the session is successfully established, the latest MOD and the second key from the UE
description: User Equipment (UE) refers to devices connecting to the network, including user equipment such as smartphones, IoT devices, and other hardware that enables users to access telecommunications services.
explanation: The context explicitly mentions 'User Equipment' in relation to its interaction with the network for call establishment, diversion, and media protection. This indicates UE's role as a device connecting to the network, hence classified under Device.
section_title: 9.3.1	SDES-based solution
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biotag_Description: B-Device,I-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O