[asterisk-users] hum noise

[Rilawich Ango]

My configuration is simple as below.

SIP phone <-> asterisk <-> CISCO <-> T1

Do you mean the hum noise is created by electric-magnetic field?
Asterisk can do nothing to eliminate it?

On Sun, Mar 29, 2009 at 2:47 AM, Steve Edwards
<asterisk.org at sedwards.com> wrote:
> On Sat, 28 Mar 2009, Rilawich Ango wrote:
>
>> We are experiencing the hum noise when the conversion of 2 parties is
>> established.  How can we eliminate that noise?  ango
>
> It depends on the source :)
>
> What computer, what type of connection (Zap (I'm a 1.2 Druid), SIP, IAX),
> what interface hardware (none, t100p, etc.)? Anything else like "the
> channel bank sits atop the isolation transformer for the entire building?"
>
> I built an Asterisk server out of an old Fiire Station. It's Via micro-atx
> in a "shoe-box" and a tdm400. Having everything crammed into such a small
> space put the horizontally mounted tdm card millimeters above the CPU. The
> noise during "dialtone" was so bad I scrapped the project there and then.
>
> Thanks in advance,
> ------------------------------------------------------------------------
> Steve Edwards      sedwards at sedwards.com      Voice: +1-760-468-3867 PST
> Newline                                             Fax: +1-760-731-3000
>
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