name: SDES
full_form: Session Description Protocol Security
context: point of IMS-AGW with SDES keyes-1 as the encryption keys and encrypted from Egress point of IMS-AGW to the other end using SDES keys-2 as the encryption keys. The S-CSCF is aware of only the SDES keys-2 as it sees that in the SDP of the SIP messages. For Case 1 and Case 2, the P-CSCF shall provide the SDES keys to the DF2. For Case 3, either of the two, S-CSCF or the P-CSCF, can send the SDES keys to the DF2. DF2 has to use the SDES keys received from the P-CSCF for its handling (i.e., sending it to DF3) to perform the decryption. For Case 3, if the P-CSCF does not send the SDES Keys to the DF2, then the DF2 will use the SDES keys received from the S-CSCF for its handling. In a scenario like this, an implementation can also be such that the CC interception is always done at the Egress point of IMS-AGW (i.e., only Case 3), but because of some deployment situations and regulations, there may also be a need to perform the CC interception at the Ingress point of IMS-AGW (Case 2) or at
description: Session Description Protocol Security (SDES) is a protocol used for securing session descriptions in IP networks. It provides end-to-end encryption and authentication for media streams, ensuring confidentiality and integrity of the communication.
explanation: The text describes SDES as a protocol that secures session descriptions and media streams within IP networks. This functionality aligns with the definition of a protocol, which establishes rules and procedures for data exchange.
section_title: G.4	CC Interception of transcoded media with e2e hop-by-hop encryption
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biotag_Description: B-Protocol,I-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O