On Tue, 31 Jul 2012 09:44:26 +0100 Sebastian Arcus <s...@open-t.co.uk> wrote:
> I have two setups with SIP hardware phones as extensions and POTS > lines as trunks. Internal SIP to SIP calls are crystal clear, but all > calls bridged to POTS have a significant amount of static noise. The > problem is that if I plug a POTS phone directly into the line, there > is almost no static noise - the line is clean. It's like Asterisk (or > the hardware) amplifies the static noise. What I've tried so far: > > 1. Connect Asterisk with a short cable directly into the master phone > socket, where it enters the building. > 2. One of the lines carries ADSL - so I double filtered it. > 3. Tried three different phone sets (one Grandstream, two Cisco > models). > 4. Tried an OpenVox A400P PCI card and a Sangoma U100 USB > adapter as analogue-to-digital interfaces. Have you run fxotune? I remember doing that when we had analog lines. You'd have to look up how--maybe just in the fxotune man page. -- C. Chad Wallace, B.Sc. The Lodging Company http://www.lodgingcompany.com/ OpenPGP Public Key ID: 0x262208A0 -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
