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Category Archives: GNU/Linux General
Sending UDP packets from the command line
Although is pretty easy to write a perl/python script to send UDP data, I wanted to be able to send a UDP message from the command line to test some code quickly. After 15 seconds of googling I found the … Continue reading
Posted in linux
20 Comments
Busy November 2011
I attended 3 Linux/Telephony events in this past November 2011. All of them are focused on the Latino American community. Find the presentations below: – Elastix World 2011, Mexico D.F. Nov 3-4 – “Negociación de codecs en Asterisk” – FSL, Vallarta, … Continue reading
Posted in asterisk, freeswitch, linux, voip
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Linux Core Dumps
Note that most of the theory (particularly the low level segmentation fault details) are also valid for Windows platforms and other operating systems. The commands to configure core dumps and retrieve them are Linux specific though. I also assume that … Continue reading
Posted in asterisk, freeswitch, linux
2 Comments
Wanpipemon cookies: ISDN pcap traces
PRI and BRI telephony links use the Q.931 and Q.921 protocols in its respective D-channel for call control and link reliability respectively. It is sometimes required to analyze protocol messages in a given link in order to troubleshoot call problems. Wanpipemon makes possible … Continue reading
Posted in linux, wanpipemon
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GIT hooks
I started using git hooks to update a clone repository with git pull just after every push to the repository. It was a bit of a pain to get it to work. The hook kept complaining about “fatal: Not a … Continue reading
Posted in git, linux
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Recursively find topmost SVN directory
I’ve been doing some refactoring on the build system for our transcoding package (http://wiki.sangoma.com/media-transcoding-download) for the Sangoma Transcoding D-Series cards. It is just a simple Makefile, however, there are some non-open source bits that also need to be built and … Continue reading
I hate SELinux
I am not a security-savvy person, even though I know pretty well how to code defensively to avoid security issues in my C code, my security knowledge in a Linux system is pretty average (use firewall, do not run services … Continue reading
Posted in C/C++, GNU/Linux General, linux
2 Comments
Graphviz
Some weeks ago I found this program called Graphviz, seems rather interesting, can’t wait to use it in any future project documentation I get involved with. Particularly useful to design/document state machines that are common in telephony.
Posted in GNU/Linux General
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Quick tip for debugging deadlocks
If you ever find yourself with a deadlock in your application, you can use gdb to attach to the application, then sometimes you find one of the threads that is stuck trying to lock mutex x. Then you need to … Continue reading
New Project – Sangoma Bridge
A couple of months ago I wrote a little application for Regulus Labs. The application is a simple daemon bridge between Sangoma E1 devices receving ISDN PRI calls and a TCP IP server. Everything received on the telephony side was … Continue reading
Posted in C/C++, linux
2 Comments