July 2017
Intermediate to advanced
434 pages
12h 59m
English
Content preview from FreeSWITCH 1.8
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Registration and call attempts monitoring
Some tools overwhelm VoIP systems by sending fake authorization attempts to them without ever responding to the challenge request that is used in SIP. One popular tool is often referred to as friendly scanner or SIPvicious. These types of tools keep a system busy handling bogus requests, overloading the system, making it difficult to handle real requests, and so on. Another suspicious behavior can be detected from someone trying to make long distance or international calls repeatedly within a short time period.
FreeSWITCH provides the ability to log a warning when an attempt is made to utilize credentials in the system (recognized or not). Programs such as Fail2Ban may then be used to monitor the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.