Microsoft is hacking my Asterisk??? O_o

[Max Tulyev <maxtul () netassist ua>]

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?