Kamailio Install Module Git

Generally, when I deploy Kamailio, I use git. Many reasons for this (including being able to quickly apply a patch or fix), but that’s a discussion for another time. If you’ve installed from git and need to add a new module (that hasn’t already been built/installed), the process is very straight forward (and simple). Step 1: Install Dependencies Some modules require libraries to be installed. For example, the jansson module wants the jansson library to be installed....

December 16, 2021 · 1 min · Fred Posner

Freeswitch 1.10.7 Released

The major announcement at ClueCon 2021 was the release of FreeSWITCH 1.10.7. Highlights from this release: fixes for security advisories (upgrade today) support for Debian 11 bug fixes etc There’s a great presentation from Sandro Gauci regarding the story behind some of the vulnerabilities he (and his team) discovered/submitted. Included in his story, is one of my favorite moments from Kamailio World. Read More Enable Security: Killing bugs … one vulnerability report at a time Speaker Deck: Sandro’s slides from ClueCon FreeSWITCH 1....

October 29, 2021 · 1 min · Fred Posner

APIBAN Now Has IPset

APIBAN helps prevent unwanted SIP traffic by identifying addresses of known bad actors before they attack your system. Bad actors are collected through globally deployed honeypots and curated by LOD/APIBAN. APIBAN started from discussions at tech conferences (in particular Kamailio World and Astricon). Most of the attendees had seen increases in malicious SIP traffic and we all thought there should be a way to share the active “bad actors.” When I found myself with some downtime, and with the support of LOD, some honeypots were deployed… and API made to share the data, and APIBAN was born....

October 21, 2021 · 2 min · Fred Posner

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

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

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


Had a great time visiting with members of the open source VoIP community in Fort Lauderdale for open source world / itexpo 2020. I was excited to discuss Kamailio and other aspects of communication as well as get some important hardware discussions in person… it’s an interesting time as hardware and software vendors seem to be merging left and right. ...

February 21, 2020 · 1 min · Fred Posner

Coming Soon: ITEXPO

From February 11th through 15th, 2020, Open Source World (or open source summit?) will be colocated at ITEXPO 2020 in beautiful Fort Lauderdale, Florida. This year, I will be speaking the gospel of Kamailio with a presentation entitled, “Using Kamailio to Secure Your Communications” (currently scheduled for February 13th at 3pm). What previously had been Asterisk World has been replaced with Open Source World… and has attracted an incredible array of speakers from the open source RTC community; including Dan Jenkins, Lorenzo Mangani, Anthony Minessale, Nir Simionovich, Jared Smith, James Body, David Duffett, Allison Smith, Eric Klein, and more!...

January 30, 2020 · 1 min · Fred Posner

Go vs Node

I’m not a programmer. Never tried to pass myself off as one — which made for a really, really awkward interview once… but that’s another story. Anyway, I’ve been creating “APIs” in Perl for a while using Perl CGI on NGINX. It’s not a REST API whatsoever, but I enjoy scripting in Perl and (1) got the job done, (2) was fast, and (3) no learning curve. ...

November 18, 2019 · 2 min · Fred Posner