In my opinion it should be minimum 45 seconds imagine the case of elderly people, or those who can’t respond quickly will face missed calls and inconvenience. This shit practice should be stopped. Now trai is pug of Jio will do it in favour of them only. Comfort of customers should be first seen before implementing something forcebly. I see it as to earn money through interconnection charges and to offload voice traffic from its network which is already stressed up.