I am not sure I really like that headline, but no matter.
Every time we have changed something about our home phone at Telstra, it reverts to a short ring time before the answer machine picks it up. I've had to call up and ask the ring time to be extended. Telstra liked short ring times, as you could not get there fast enough and the person left a message, thereby incurring a another phone call charge when you rang the person back. If you are directly paying for telephone calls now, get a grip and sort your phone out.
Since changing our mobile phones from Telstra to Aldi, the ring time is too short. I found this sequence of numbers to press to extend the ring time, and even though within the number is contained 101, Telstra's message service number, this has worked for our now non Telstra phones to extend the ring time. The last number contained within is the number of seconds for your phone to ring before diverting to the message service. 30 is the maximum.