Steven Critchfield wrote:
On Fri, 2005-02-11 at 15:05 +0800, Steve Underwood wrote:
Steven Critchfield wrote:
On Fri, 2005-02-11 at 15:35 +1100, Eric Bishop wrote:
2. Is only a problem in 2-wire technologies (ie analog and BRI ISDN lines)?
It is just an analog problem. That is why a BRI can actually transmit
direct digital data instead of audio data.
There is enough spill from the earpiece to the mike on most phones, that
EC is required even on a digital phone.
Fine, but to get an earpiece, you make an analog portion of the link
unless someone has made some digital ears with direct data jacks on the
side of human heads.
So if you say that a SIP handset is like a 4 wire set, and BRI is like a
4 wire set, and asterisk doesn't mix the ins and outs, you effectively
are 4 wire through the portion you can control. The remote side is up to
whoever you call.
What you said was not actually wrong. However, 9 out of 10 people
reading it will see "echo is something that affects only analogue
phones". People keep saying this. Its even in comments in the * source
code. Its wrong.
Regards,
Steve
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