How to organize voice calls VK api?

Question

Bots

Hello, there is a rather popular call-prikol bot. Its essence is drawings and congratulations by phone. The bot is on vkontakte and telegram. The system works like this, 1 test call is given, you choose a voice recording (drawing or congratulations), then write the number of who you want to play and wait for the recording of the conversation. If the interlocutor did not pick up the phone, the call is not written off. Other calls are free of charge. I'm wondering how such a system actually works. Most likely, it will not do without a database (to store the number of attempts for each user). There are also interval calls, and from different numbers ... I would like to understand how such a system functions inside. How does it even happen to call and record a conversation, etc.

Answer 1

No way. VK does not have an API for this. Decompile their official android or apple app and see how they do it.
And if calls to the number specified, then use the api of third-party services