Is it possible to make an autoresponder for iOS?

Question

Answering machine

Good afternoon.
I'm wondering if iOS allows you to create applications with the function of automatically answering a phone call? For example, after 15 seconds of a call, the answering machine turns on, writes a message to the phone's memory and shows the owner of the device a notification about it.
The fact is that, for example, the operator's voice mail service is paid and not cheap if you use it often. And the standard iOS answering machine doesn't seem to be compatible with my carrier.
Searching the App Store and Google turns up almost nothing. I found an answering machine for one of the old versions of iOS with a jailbreak, but this is not a suitable option.

Answer 1

This can only be implemented with a jailbreak and it will require quite a lot of effort - there are such wilds that mom do not cry.