Recently came back from a month overseas and had problems with both our landlines (one of which has the ADSL on it). The one with the ADSL on it was impossible to use for voice calls (internet sync rates below 1mbps when we usually get around 5 mbps) while the other line was usable but with constant buzz.
An hour or so on the phone with pleasant lady from Telecom faults resulted in clear problem with ADSL line external to the house, and the lesser problem with the other line being slightly less obvious. I had the sneaking suspicion the two were related because of our setup (and apparently it rained a hell of a lot while we were away!). Anyway, she promised to send someone between 11 and 3 today. Very efficient and personable chap from Chorus turned up this morning and spent two hours fixing the problem (badly corroded joints) at a junction box we have about halfway from our house to the roadside junction (house is about 200m from main highway).
Anyway - well done to both outfits for a good, prompt fixit job.