Handling Non-SIP Attacks With Kamailio

Recently, I posted about using Kamailio’s PIKE module to help block excessive SIP traffic. This is a great tool for helping your system handle high traffic SIP, such as floods. But, what can you do when someone sends garbage or non-SIP traffic to your system? Kamailio’s SIP parser is handled in the core and was recently upgraded in v5.5 with logging improvements, as well as simplified implementation, static map for header name, and type for parsing....

October 1, 2021 · 3 min · Fred Posner

Moving to Hugo

After spending many years on Wordpress, I’ve decided to make a change in the software running this site. First of all, I have absolutely nothing against wordpress. I’ve used wordpress for well over 15 years at this point. There’s a simple reason why so much of the web is powered by wordpress – it’s clean, easy to run/maintain, and there’s great templates available. You can literally get started in 5 minutes....

September 29, 2021 · 1 min · Fred Posner

Handling SIP Flood Attacks Using Kamailio

The Pike module in Kamailio provides detection and alerting of “excessive” SIP traffic to your system. Within the module you can configure the rate limit, time period, and amount of time that the IP (ipv4 or ipv6) should be blocked. For example, you can configure your system to say that 30 requests from the same IP within 5 seconds should trigger a block of that IP for 5 minutes. I absolutely love this module and, in my case, Pike more often finds abusive traffic (like dialers) than SIP floods attacks....

September 26, 2021 · 3 min · Fred Posner

Thanksgiving 2020

Normally, I write these posts the night before Thanksgiving… after all, Thanksgiving remains my absolute favorite holiday. A time to gather with family (remember…. friends are the family you choose), express gratitude, and eat great food. The gather part this year didn’t happen thanks to the pandemic. Losing the bakery and not seeing family/friends since February made it hard to focus on what we have to be thankful for… not as hard as when Ricardo was murdered, but honestly it’s been a shit year....

November 27, 2020 · 2 min · Fred Posner

The Palner Group @ 20 Years

Twenty years ago, I started The Palner Group, Inc. with the goal of providing technology consulting as a service. 2000 feels like a century ago (I’ve not thought about the millennium bug for some time now) and I’m using this anniversary to reflect on having this company for two decades. The Palner Group, Inc. isn’t my first business. A few years earlier I had started a nutritional supplement sales company (Vitastorm) with a great friend of mine, Rick Pallisso....

October 1, 2020 · 3 min · Fred Posner

Kamailio World (online) 2020

This has been a really different year. After attending ITEXPO back in February, I was looking forward to a great visit to Berlin for Kamailio World. Attending conferences is one of my favorite parts of working with open source VoIP software, like Kamailio, and to not have these personal connections to community is definitely offsetting. After the in-person conference was cancelled, a virtual Kamailio World was held this past September 2-3 to celebrate the 19th birthday of Kamailio....

September 7, 2020 · 1 min · Fred Posner

I love my wife

Been a rough few months for the wife’s business and sadly, we had to announce the closure of Bearkery® earlier this week. For 10 years, I’ve watched Yeni pour her heart and sole into the bakery and although we saw it coming and prepared, the end was nonetheless heartbreaking. She’s done some amazing work… gained some incredible press (now and then)… and started the bakery from absolutely nothing. I couldn’t be more proud of my amazing wife....

May 19, 2020 · 3 min · Fred Posner

Simple TLS Gateway

Well, 2020 is certainly a strange year… Some of us have been working from home for a very long time while others are now just understanding the benefits. Of course, when a drastic change in work environment becomes a forced change, the implementation can be quite daunting. Let’s look at telephony for example. Many small, medium, and even enterprise PBX deployments have been designed to only allow endpoints (aka phones) to connect from within the local network....

May 5, 2020 · 2 min · Fred Posner

Kamailio, RTPengine, Centos8

Had to install kamailio and rtpengine on centos8 recently… hopefully this saves you some time: https://github.com/fredposner/scripts/blob/master/kamailio/centos8_install.md

May 1, 2020 · 1 min · Fred Posner

Happy Anniversary

11 years and 1 branch (shown above)

May 1, 2020 · 1 min · Fred Posner