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I recently had the need to get a USB to 1-Wire bus adapter working on an Ubuntu Virtual Machine running inside a Ubuntu host. Both systems were Ubuntu Server 10.04. However, after testing under Windows, where the USB device worked perfectly, when exported to the Ubuntu host, the USB device was always ‘busy’. Here are my findings on how to resolve this issue to a successful conclusion. Continue reading HowTo: Enabling a USB device in a VirtualBox VM in Ubuntu » OWFS, the One Wire Filing System for Linux is a very useful interface for communicating with the Maxim 1-Wire range of devices. Most of the commentaries on how to install OWFS refer to much older versions of Ubuntu than 10.04, this article is an upgraded version to cover the newer versions of the packages concerned. Continue reading HowTo: Install OWFS onto Ubuntu 10.04 Server » Due to the nature of how Virtual Machines are operated, maintaining time is quite difficult. With the Oracle VirtualBox, this is no exception. Time keeping on some of my VMs has been a serious issue. I tried to used NTP to resolve the problem, however the clock accuracy is so poor within the VM, that the offsets and jitters are far too large for the clock correction algorithms to correct. So an alternative solution was needed. It appears this was a well documented problem. The resolution was to make sure that I was using a version where this issue had been fixed in the Guest Additions. Continue reading HowTo: VirtualBox Guest Additions (Command Line) – Time »  Stinging Nettle As I have a large field, and there appears to be a good supply of nettles both here and generally on the island. I decided that I should have a go at making some fertilizer based on the ubiquitous stinging nettle. Below is the method I’m using. For the last few weeks I have been bashing away at trying to get an inbound SIP trunk to go somewhere sensible, rather than to ‘Number not in service’ message being played to a caller. The problem is that the inbound SIP call is classified by Asterisk as an ‘Unknown Peer’ with an error message similar to: “Received incoming SIP connection from unknown peer to xxxxxxxxx”. This means that the call can’t be processed correctly. After processing the information from a selection of forums, I have come up with this solution. This article describes the changes needed to allow incoming SIP calls to be processed correctly, like any other trunk. This article does not cover SIP extensions, only SIP trunks. |
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