Re: [SAGE] Asterisk, Risk?

[Doug Hughes <doug@eng.auburn.edu>]

On Tue, 8 Mar 2005, Dan Lowe wrote:

>
> On Mar 8, 2005, at 10:03 AM, Mark R. Lindsey wrote:
>
> > Our office phone system uses Asterisk with a PRI card, and it suffers
> > from some echo cancelation problems (i.e., I almost always hear myself
> > echoing back). Some of the nicer voice gateways do a better job with
> > this.
>
> I've never had this problem, but we have seen echo problems which we
> traced back to certain end user hardware.  One turned out to be a
> crappy POTS speaker phone, the other a cell phone bluetooth headset.
> In both cases when we asked the person with the offending hardware to
> hang up, the problem magically disappeared.  In both cases they were
> dialed in via the PRI gateway.
>
> I've heard feedback loops too, which we traced back to people using
> software phones whose speaker and microphone were in close proximity.
> Having those users switch to headphones (or full headsets) resolved the
> issue.
>

yeah, according to our VOIP experts, all echo is caused by A/D conversions
on the end points. It's always somebody's headset or something like that.
bad speaker. bad headset.. etc.