No it's not Microsoft. Welcome to the internet. It's probably someone on Azure trying to find vulnerable systems. Have a look at some of the Videos from Astricon explaining the pitfalls of voip fraud and security.
https://www.youtube.com/watch?v=9Wzzlo1kfTQ (disclaimer: that's my talk) https://www.youtube.com/watch?v=CCDqpJc2aXQ https://www.youtube.com/watch?v=h5Fw70KzAls https://www.youtube.com/watch?v=hLFz8mlmKIY On Tue, Nov 3, 2020 at 2:55 PM Max Tulyev <max...@netassist.ua> wrote: > Hi All, > > I have just seen a number of IPs trying to brute-force my VoIP server > from Microsoft network. For example, 13.90.148.133, 20.55.203.249, > 40.76.244.210... Traceroute really goes to MSN. More than a half of all > usual attempts to hack my Asterisk I got today, came from MSN. > > What is happening? Am I missed something? >