[Asterisk-Users] Cisco 7960 mic generating noise on other end

[Greg Oliver]

I have had several issues flashing between SCCP/SIP/MGCP on those phones
where it will eventually cause the handset to bleed through the
speakerphone.  Once that happens, the phone is basically trash - it
never stops...

-Greg



> > I'm having a problem with one of our 7960.  They all run latest 7.4
> > SIP firmware.
> > 
> > The problem appears on the other end.  The other end constantly hears
> > a 'crackling' noise.  I have tested using phone set, headset and
> > speaker and the noise appears on all cases.  I have other 7960 setup
> > exactly same way (using same asterisk, firmware, etc) so it looks like
> > a hardware issue.
> > 
> > I'd appreciate if anyone has any insight on this or any other similar
> > issues before I open the thing.