On Mon, Apr 7, 2008 at 8:17 AM, Col Ferguson <[EMAIL PROTECTED]> wrote: > I have been working on a system where sometimes the users get a horrible > screeching noise that gets louder, typically as a call is hung up. > > The system has 2 analog astribank channels with 8 FXO and 56 FXS ports, and > 2 SIP phones, Asterisk 1.4.18, Zaptel 1.4.9.2. It is using the oslec echo > canceller. > > In my testing, I have only experienced it on hang up of a call, but some of > the users say they have heard it at other times. It sounds like feedback > building up. The Receptionist said she had taken about 40 calls this > morning, and had only heard it once. > > Because of the nature of the noise I have heard, I suspect something with > the echo cancelling, but I have no idea where to start looking. Maybe it > would just be easier/quicker to try a different echo canceller. > > There is no noticable echo during conversations. > > No one has heard the noise between the 2 sip phones, but as it seems > intermittent, this may be irrelevant. > > Any hints as to how to track this noise down ? > > Thanks, > Col >
Start by turning off echo can on your zap channels. I have setup many analog FXI systems that never needed echo can. Thanks, Steve Totaro _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users