I hope you are doing great.
I have an Asterisk PBX system and two weeks ago our telephone service providers reported that we had an excesive traffic.
We check CDR reports and we found a lot of calls with “s” destination every minute exactly. We are trying everything to stop that, all access from WAN to LAN is closed (SIP, SSH, UDP), access from VPN to LAN is allowed because we work over VPN’s.
Also, “allow anonymous calls” and “allow SIP guests” are set to “NO”, but nothing is working for us, the problem persists. We need to solve this issue ASAP.
Any suggestion to fix the problem?
I hope you can help us. Thanks in advance.