I'm having some intermittent line noise problems which have come back since the cabinet I'm connected to was upgraded to ADSL2+ a couple of weeks ago. Aside from intermittent audible noise while making phone calls, my ADSL router has been reporting relatively high levels of RX CRC errors (>1000 per 24 hours, and no TX CRC errors). The ADSL connection hasn't been dropping, however.
I'm on Telecom's Pro plan with interleaving switched off, and if possible I'd like keep it that way as I'm a fairly heavy VoIP user. I've isolated the internal wiring by connecting a BT socket directly to the demarcation point (sorry if I'm not supposed to do that!) and the CRC errors were still appearing at the same rate, so the issue is definitely somewhere at Telecom's end. The router reported loop attenuation of 8dB when it was connected to the demarcation point.
I'd really like to get this sorted out, but I'm not sure what the best way to proceed would be. I'm presuming it's a physical cabling problem somewhere down the line. Since the problem isn't causing my connection to drop, would Telecom even count it as a fault? If they would, what would be the best way to report the problem, and what would be the best thing to say to trigger some action? I had a similar problem a couple of years ago, and 120 were a bit of a nightmare.