When a new phone system gets installed or a new circuit is plugged in,the installation vendor must perform several outbound test calls. Typically,these include local,long distance,toll-free and 911 calls. In some cases,the client requires the ability to dial international numbers and in this case,sometimes things can go sideways.
When I do 911 test calls,I notify the 911 operator that I am a phone system installer putting in a new system or circuit. I then ask what caller ID they are seeing and what address is being displayed.
I was on a circuit cut over that lasted four hours while the dial tone vendor went through different configurations to get international dialing working along with the other normal access numbers.
Usually,the dial tone provider comes up with a number for international dial testing,however,when not on a cut over call,it’s handy to have one of these numbers handy -
This number is an automated time of day announcement from Australia,so you won’t be harrassing anyone.