Why was my IP blacklisted?

[batarong]

Hello, I have a question.

I've been experimenting with Fax services, and after successful testing I've got blacklisted.
This is what I got after trying to log in via the beta 3CX client and MicroSIP.
I used Fax VoIP FSP (virtual Fax) and the legacy Windows Fax and Scan app. I believe my PC was sending requests to the FSP fax server too fast, which led to the blacklist.
Here's an example of what I was doing with the fax via Discord and the fax driver.
Since 3CX has SIP, the SIP from the vFax also runs on 127.0.0.1 (The same IP my selfhosted 3CX SBC runs on (but not the same port!)), it was probably forwarding it to the SMB, which forwarded it to the PBX.
Is there a way to get this fixed?

Cheers
- Batarong

 

[Guillaume Bourgeois]

Is there a way to get this fixed?

Yes, there’s a very simple solution: follow 3CX’s requirements and install the SBC on a dedicated environment.

The 3CX SBC, just like the PBX, isn’t designed to share its environment with other applications or services. Installing another SIP service on the same machine is even more problematic, even if it uses different ports, as it can create conflicts or unpredictable behavior.

The proper approach is therefore to move the SIP fax service to a separate machine and keep the SBC environment dedicated exclusively to 3CX.