Tag: howto

  • Cron, crontab example reference and how to run things periodically in GNU/Linux and Unix

    Cron is a job scheduler found in most Unix-like operating systems. “Chronos”, which is the Greek word for “time”, is where the name cron comes from. Cron makes it possible to schedule jobs, which can be commands, a series of commands, or scripts, that you want to run periodically. Common uses are backups, notifications, periodic […]

  • Fixing missing menu entries of Opera and Skype in Debian GNU/Linux

    Unfortunately the third-party packages of Opera and Skype do not contain menu entries for the Debian menu system. Not very surprisingly one might think, but I just think it’s sloppy. If you, like me, like the Debian menu system and want Opera and Skype available in it, do the following to solve that, until the […]

  • How to set up a SIP trunk in the Asterisk PBX

    In my┬áprevious article we configured Asterisk with some SIP-devices, and created a basic dialplan so that they could dial eachother. We also created two additional extensions for test purposes. This time I will show you how to configure a SIP trunk, and add extensions in the dialplan so that the telephones can dial out through […]

  • An introduction to Asterisk, The Open Source Telephony Project

    Asterisk is software that turns an ordinary computer into a voice communications server. Asterisk is the world’s most powerful and popular telephony development tool-kit. It is used by small businesses, large businesses, call centers, carriers and governments worldwide. Asterisk is open source and is available free to all under the terms of the GPL. That […]

  • GNS3: Build and configure a CCNA PPP lab using GNS3, dynamips, and vpcs

    Cisco’s Packet Tracer works for very basic labs, but it has so many irritating small things that are missing, that it causes more frustration than nice experiences if doing anything involving anything more than the absoulte basic configurations. It does have one strong point, and it is CPU and memory usage, compared to emulating router […]