Hi, it may be worth having a look in your 'call' settings. Some handsets - the HTC One included - have the option to check and change the 'unanswered' settings :-
1) Open call settings.
2) Tap 'call forwarding' - current settings are retrieved from the network.
3) Tap 'forward when unanswered'.
4) Tap current delay setting box.
5) Choose new delay.
6) Save and exit.
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