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Question : Asterisk (using FreePbX) - can I limit the incoming SIP traffic to my provider's IPs?
Turns out that when my firewall is set to perform SIP transformations, I cannot setup a rule that only permits SIP 5060-1 from my provider addresses. The firewall accepts everything and forwards it via NAT to my internal Asterisk PBX. I am concerned about hackers trying to guess registration information so I'd like to only permit the valid external IP address range in Asterisk. I see the permit/deny options, but they seem like they are for each extension, and I want to block all of asterisk from responding to invalid addresses. Is there a global way to permit/deny? Yes, I could consider iptables, etc, but looking for a way to do this in asterisk. Thanks
Answer : Asterisk (using FreePbX) - can I limit the incoming SIP traffic to my provider's IPs?
I'm not aware of any way to do this other than using a firewall such as iptables. It has been discussed on the asterisk mailing lists in the past but the only working suggestion I'm aware of is using a firewall.
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