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omight
2005 Feb 10
4
Why echo occurs
Hi all,
Can someone give me a simple rational explanation why a $5 analog
handset gives me no echo whatsoever on an analog PSTN line, but
PSTN-VoIP devices such as the TDM400 and Sipuras do and thus require
software-based echo cancellation. Surely a $5 analog handset does not
have an "echo canceller".
The echo I mean is when I hear myself while talking to another party.
I have heard