Prior to the creation of Stasis Message Bus API, the purpose of this API was to provide a generic way to share events between Asterisk modules. Once there was a need to disseminate data whose definition was provided by the producers/consumers, it was no longer possible to use the binary representation in the generic event system.

That aside, the generic event system is still useful and used by several modules in Asterisk.

CEL uses the ast_event representation to pass information to registered backends.
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