I have an account with Westnet here in Australia which resells ADSL services from our government Telco Telstra.. This means that all faults have be handled secondhand through Westnet.
My problems started when I started getting regular dropouts and a loud hiss on my telephone. I contacted Westnet - they sent a TELSTRA tech who passed the line as OK.
He suggested I lodge a an ADSL fault with Westnet and buy a new filter. This I did with no effect. The ADSL dropped out between i min and 30+ minutes. and still has the loud hiss on the phone - if I talk to another person my talk comes squelched.
The TELSTRA ADSL techs said that was no problem with their network. I bought the best modem available here -a Netgear D6300 which included an ADSL 2+ filter
The situation is now that I have just the new modem and the new filter attached. I have no other connections of any sort attached to the incoming phone line, I have disconnect/unplugged any cordless phones, disconnected the Foxtel line and still I get the drop outs.
I have experimented with connecting a simple wired phone and noticed that if I dial out the ADSL will drop out within 10 seconds. I am not a skilled tech and I am getting fed up with dealing with online help who read out loud from a manual, Each call takes between half hour and 2 hours before I talk the manual reader. THis has gone on for 3 day days now.