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By Jim Van Meggelen; Jared Smith; Leif Madsen

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Additional info for Asterisk

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Since Asterisk requires frequent high-priority access to the CPU, it does not get along well with other applications, and if Asterisk must coexist with other apps, the system may require special optimizations. This primarily involves the assignment of priorities to various applications in the system and, during installation, careful attention to which applications are installed as services. Kernel optimizations A kernel optimized for the performance of one specific application is something that very few Linux distributions offer by default and, thus, it requires some thought.

Water is a disaster for electronics for two main reasons: 1) water is a catalyst for corrosion, and 2) water is conductive enough that it ‖ On a hobby system, this is probably too much to ask, but if you are planning on using Asterisk for anything important, at least be sure to give it a fighting chance; don’t put anything like air conditioners, photocopiers, laser printers, or motors on the same circuit. The strain such items place on your power supply will shorten its life expectancy. 24 | Chapter 2: Preparing a System for Asterisk can cause short circuits.

22 | Chapter 2: Preparing a System for Asterisk relation to something, we are in danger of assuming things that may not be so. If you measure the voltage between two grounding references, you’ll often find that there is a voltage potential between them. This voltage potential between grounding points can be significant enough to cause logic errors—or even damage—in a system where more than one path to ground is present. One of the authors recalls once frying a sound card he was trying to connect to a friend’s stereo system.

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