I've finally worked out how to increase the number of rings before the answerphone kicks on my 8500 series BT landline phone:
Click on Menu;
Click 'select' on the first option: answer phone
use the down arrow to: settings; select OK
arrow down to Ans. &record; select OK ( you may have to select this option twice)
It now shows: "answer delay"; now use the right arrow to increase the number of rings up to a max of 10 rings and select Save.
Its taken me several hours of searching BT and google to resolve that issue. 😀
