Activity Log Entry Explanation Please

[targeted]

Using 3cx V9 SP4

I'd like to undestand the following that appeared in my 3cx Activity Log yesterday. I think it's another VOIP system (asterisk) trying to connect to my 3cx server and make a call to an external number but, I'm not sure if I'm right about this. I'd like confirmation of my understanding or, if possible, the correct explanation. It will let me know if I need to do anything. I have removed my IP address for security.

Any suggestions for actions I might need to take will be most welcome.

22:24:06.644 Requests rate from IP 67.205.89.121 is too high! Blacklisted for 167 seconds
22:24:06.644 [CM500002]: Unidentified incoming call. Review INVITE and adjust source identification:
INVITE sip:810442070661000@mypublicip SIP/2.0
Via: SIP/2.0/UDP 67.205.89.121:52076;branch=z123RE8gBkor3;rport=52076
Max-Forwards: 70
Contact: <sip:[email protected]>
To: <sip:810442070661000@mypublicip>
From: "asterisk"<sip:[email protected]>;tag=z321RE8gBkor3
Call-ID: [email protected]
CSeq: 102 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO
Supported: replaces
User-Agent: Asterisk PBX
Content-Length: 0

22:24:06.644 [CM302001]: Authorization system can not identify source of: SipReq: INVITE [email protected] tid=41f2e11ffe3308404fa28107d791f47c cseq=INVITE [email protected] / 102 from(wire)

 

[SY]

If you detected it just yesterday, then block this IP.
The message

22:24:06.644 Requests rate from IP 67.205.89.121 is too high! Blacklisted for 167 seconds

Means that there were a lot of requests coming from the IP