name: CS
full_form: Circuit Switched
context: The CS Proxy is responsible for CSK key management. Hence, should the CSK require renewal, the CS Proxy will create and send a âkey download' message to the MC client containing the new CSK. This functionality is as currently defined for a MCX Server. As signalling proxies may present the one or multiple SIP URIs externally, the same client may attempt to connect to the same CS Proxy twice, using different URIs and CSKs each time. In this scenario, the CS Proxy may remove CSK ambiguity by using the âCSK key download' procedure as follows: 1) The MC client connects to the CS Proxy using the URI âA'. The MC client provides CSKA. 2) The CS Proxy receives CSKA and the MC client and CS Proxy use CSKA to protect application signalling. 3) The MC client connects to the CS Proxy using the URI âB'. The MC client provides CSKB. 4) The CS Proxy observes that the same client has connected again using a different URI. 5) The CS Proxy performs a âCSK key download' to update CSKB. The CS Proxy sets
description: Circuit Switched (CS) is an operational mode in telecommunications where a dedicated communication channel is established between two endpoints for the duration of the connection. This contrasts with packet switching, where data is transmitted in packets over a shared channel.
explanation: The text describes CS as an operational mode in telecommunications, differentiating it from packet switching based on how communication channels are managed.
section_title: 7.2.5.3.3.5	CSK key download from a CS Proxy
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