Strange improvement in ping

I've been with sky now for 3 years and seen my friends speeds and never have I seen a telephone connections ping like mine is. Just recently my ping went from 42 to 22 ms ping and I'm not complaining , I just didnt realise that a ping lower than 35 was achievable over a telephone line. Also my profile wasn't changed and my speeds are 15 down and 1.22 up.

you can get around 3.5ms round trip to the exchange with interleaving of
22ms is just delays 8 (8 each way = 16ms delay) with low impulse noise protection levels