If your phone service relies on the provider VOIP.MS, then like us at OPLF you are from time to time needing to place a test telephone call to try to figure out whether the latest thing that you changed in your configuration has left you with functioning telephone service or not. This is part of dealing with the denial-of-service attack that is going on even now (blog article) against the provider VOIP.MS.
And even if your phone service does not rely on the provider VOIP.MS, it is probably only a matter of time before some denial-of-service attacker will attack the provider that your phone service depends on (this is happening, see blog article). And when that time comes you are going to need to place a test telephone number from time to time to check to see whether your VOIP service is working the way it is supposed to work, or whether the most recent thing that you changed made things better or worse.
Wouldn’t it be nice if somebody somewhere would provide a telephone number that you could call at any hour of the day or night, and you could speak and hear your own voice repeated back to you (or not), and it would tell you that your VOIP service is working correctly (or is not working correctly). I am pleased to remind you that there is such a telephone number.
Such a telephone number is provided free of charge by Oppedahl Patent Law Firm LLC! You can read about it in my blog article from four years ago. The telephone number is +1-720-230-1331.
You might as well copy down that number and tape it to your phone, so that you will have the number when you need it in a hurry so that you can test your VOIP configuration.