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This posting is provided "AS IS" with no warranties, and confers no rights. The opinions expressed within are my own and should not be attributed to any other Individual, Company or the one I work for. I just happen to be a classic techie who is passionate about getting things to work as they should do (and are sometimes advertised and marketed as being able to?) and when I can I drop notes here to help others falling in to the same traps that I have fallen in to. If this has helped then please pass it on - if you feel that I have commented in error or disagree then please feel free to discuss with me either publically or privately? Cheers, Dave
Thin Clients, VDI and Linux integration from the front lines.... Raw and sometimes unedited notes based on my experiences with VMware, Thin Clients, Linux etc.

Now I was searching on something different entirely (as is the case normally) but came across this interesting little note about running Asterix on VMWare at Christine.Net:

Cool Hack #1: Performance Tuning for Asterisk VoIP
Kristian Kielhofner, the creator of
AstLinux, showed the crowd his embedded Linux distribution for running Asterisk. This hack is important if you need your VoIP tuned for performance. First: Heavily loaded servers interfere with sound quality - but while you don't care if a web page downloads slightly slower, you may be annoyed if it happens during a phone conversation. Second: High availability. Larger-scale PABXs have redundant CPU cores, so users don't notice if one goes down. This redundant coverage is very difficult to achieve in Asterisk.

There's now an AstLinux virtual machine built with VMWare Workstation 5. This allows you to experiement with Linux and Asterisk without leaving your typical environment. This application has found a niche with people doing demos, training, or user groups.

Heartbeatd is a server daemon that checks for a "heartbeat" on other servers; if another heartbeat stops, then heartbeatd instructs its host machine to take over for the failed server. This works over both Ethernet and serial interfaces, and is supported by AstLinux. Unfortunately, if Asterisk were to crash, the daemon can't report that its own self has failed.

AstLinux-HA is most useful for VoIP-only applications, since it doesn't yet support routing.

Other limitations include Asterisk's native sounds. Christian had his pal Allison re-record all of the Asterisk sounds in the highest-quality format she could. They then converted directly into every Asterisk format. This eliminated some of the problems of transcoding into loss-based compression formats. These improved files will be publicly available in a couple of weeks.

Posted on Wednesday, January 25, 2006 7:59 PM IT Management , Real Cool Stuff , VMware and other Virtualization tools , Security | Back to top


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