Most home routers and firewalls should not have an issue, but corporate firewalls might block the audio service because it runs a unique port.
If you need to modify your firewall settings these are the IP/ ports/protocols you will need to open:
If JavaScript is not working, you will probably have a message at the top of this page informing you of this. This can be common in some corporate installations of Internet Explorer, where restrictive security settings may prevent scripts from running. You can ensure JavaScript works by following the instructions at the URL below:
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