name: POC
full_form: Push to talk Over Cellular
context: Push-to-talk systems are in principle store and forward systems with message replication for all intended receivers taking place in the PoC server. PoC systems also often support instant messaging. Furthermore, it should be noted that PoC systems may offer automatic functions for recording of all messages a user cannot receive âon-lineâ. Thus, for true end-to-end security PoC systems exhibit the same requirements on key management and media protection as the multimedia telephony described above, i.e. a group key management system capable of handling deferred delivery of media. A PoC system doesnât only handle voice but also handles other media types like e.g. video and text.
description: Push-to-talk Over Cellular (PoC) is a telecommunications service that enables real-time voice communication between users, similar to traditional walkie-talkies, but over cellular networks. It also supports instant messaging and may offer features like automatic message recording for offline users.
explanation: The context describes PoC as a system handling voice and other media types, with features like store-and-forward messaging, message replication, and support for instant messaging. This indicates that PoC is primarily a telecommunications service offering real-time communication capabilities.
section_title: 4.3	Push-to-talk (PoC)
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