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Monthly Archives: January 2009

Reducing Echo in Telephone Handsets

A common source of echo in VoIP phone systems is the telephone handsets. Of course, non-VoIP phone systems have this source of echo too, but it often is not so evident because without the buffering the echo delay is not as long.

Old Bell 500 series telephones have a wad of cotton wool in the handset to prevent sound from traveling from the receiver, through the hollow handset body, to the transmitter. But, many modern telephone handsets lack this important component. Here I show how I added cotton wool to the handset of a Linksys SPA-841 in order to reduce echo.
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How to be a Good VoIP Provider for Asterisk Users

There is more to being a good VoIP telephony provider for Asterisk users than simply offering the best balance of price and reliability. Usability is also very important. Here are some things which make for a service more convenient for Asterisk users.
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