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Securely Exposing FreePBX for Remote Access with a Focus on SIP and RTP Ports (alien.top)

submitted 11 months ago by saygon90@alien.top to c/voip@netheads.online

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Hi, due to a very extensive project, we need to expose FreePBX to the internet. Specifically, we are concerned with the SIP and RTP ports. The purpose of this action is to allow logging into the system using softphones and configured phones without the need for VPN.

In the past, I noticed that exposing port 5060 results in numerous brute force attacks where the attacker tries to impersonate an extension that exists in the system. However, due to the lack of a password, they are unable to make a phone call. Does an attacker, without knowledge of the extension password, have the ability to make calls at the expense of the client?

Ports such as 443, 80, 22, etc., will not be exposed to the world, only the ports required for telephony.

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[–] cop3x@alien.top 1 points 11 months ago (1 children)

random ports you are wasting your time, it may stop the noise of the bots that scan defaults.

just before you go to replay and tell.me.i am wrong spend some time on shodan :-)

strong passwords and good security policy, only allow what is needed.

don't have the webinterface exposed to the Internet.

[–] saygon90@alien.top 1 points 11 months ago

don't have the webinterface exposed to the Internet.

I will try to hide FreePBX behind an SBC like LibreSBC.