Panasonic Tie In - Calls from 100 1100

[ilikebirds12]

We randomly in our phone system get calls from 100 1100 Extension.
It says it's the gateway extension. Is someone trying to hack in or is there an problem?
Panasonic TDA 50 NCP500

 

[obtsystems]

If you have sip trunks or extensions that have ports open on the firewall then you are being attacked. Make sure your firewall is locked down on the sop trunk ports to sip trunk provider IP address

 

[ilikebirds12]

Yes we do have sip trunks. I will make sure the firewall only allows those ports

 

[obtsystems]

it is the ip address you need to block coming in, if your router allows it only allow your sip provider ip address in to the port 5060