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We are trying to create an IP based PA system for my institution. Our first hunch is to use an asterisk server with clients in auto-answer mode. Is there any better method, or a more apt open source framework? Our internal network is fiber backboned with mostly *nix systems.

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You might want to start looking at an RWALL command as a framework and instead of text send audio files.

Conversely you can have a very simple multicast server and client that does exactly the same thing.

Security would be your biggest concern since both approaches are inherently insecure.

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