Automatically send greeting messages to each other after answering the phone?

Ordinary mobile phones don't have this control function, do they? After answering the phone, send greetings to each other automatically. Text messages are generally not available! Unless your mobile phone is turned on, there is another function, that is, if someone calls you but you don't receive it, the mobile phone should automatically reply to others, which should be ok, but if you make others crazy after answering the phone, the feeling of mutual information should not have this function.