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You can definitely test 999 for your own VoIP without getting into trouble. I did it a couple of times in the 2010s after moving offices. You just say you're testing, there's no emergency, thank you, and hang up.

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I don't know how the UK treats this, but in the US you're supposed to call the non-emergency number and tell them you want to schedule a test call.

Makes sense. This also reduces the chances of a caller being “convinced” mid-call to tell the operator “oh, sorry, this is just a test”.

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