For information on the cabling requirements when building in a development that is serviced by:
http://www.telstra.com.au/smartcommunity/assets/telstravelocityhomewiring_1108.pdf
A very common cause of noise is incorrect ADSL filtering. If your noise is a hissing / static noise that is constantly there when you have your modem online, a good way to test this is to power down the modem while on a call. If the noise stops, then the most likely cause is filtering, in which case you may need to contact me to investigate and correct.
If your noise is more like a Buzz or an irregular crackle, the most likely cause is a carrier network issue. There are however internal customer cabling faults that could be the cause. The best course of action is call your service provider and ask for a line test to be done. If a fault is detected, they will handle the fault from there.

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