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@sedwards.com wrote:
On Sat, 28 Mar 2009, Rilawich Ango
Rilawich Ango wrote:
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?
That would be my bet. No, Asterisk can't do anything to remove EM
noise. That's up to
There are a large number of potential sources of hum and each situation will
narrow them. The first thing would be to quantify the observation. I am
assuming it is power line frequency, although that may not be the case. It is
also useful to notice whether it is fairly pure or rich in
I'd suggest calling an echo test or playback(silence) extension on your
asterisk from the SIP phone. If there's hum, then it's almost certainly
coming from the phone (my bet would be a dodgy power supply).
Probably also worth checking there are no cellphones near either endpoint. They
seem
Yes, you make a good point. Electromagnetic fields are another source of
ingress, whether from a nearby cell phone or by being located a mile away from
a 50 KW AM radio transmitter (etc.).
one does wonder why there's such inadequate shielding
As a ham radio operator, I can say that has been
HI,
We are experiencing the hum noise when the conversion of 2 parties is
established. How can we eliminate that noise? ango
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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
