Does echo only occur on analogue PSTN lines, or can it also occur on PRI and
BRI lines?
Yes, it can occur on any type of line.
If so, for the same reasons? This is a part of our consideration
to transition to BRI.
It is the result of 4-wire to 2-wire conversion somewhere between
your end and the called end. For example, if you originate a call on
a PRI/BRI, and you call a telephone number in an analog central office
a hybrid conversion will occur somewhere near that terminating CO.
That conversion _can_ be a source of echo.
In general terms, there are significantly fewer echo issues with PRI's
and BRI's then there is with any analog pstn connection.
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