How to call from a non-existent/undefined phone number?

Question

Telephony

Is there any way to make calls to Moscow city and mobile numbers so that the number is either non-existent (and it can be changed regularly) or undetectable - so that it cannot be blacklisted?
(I'm interested not for the implementation of telephone spam, but for calling those who send spam)

Answer 1

I thought about skype too

Answer 2

any operator of IP-telephony (sip-telephony) will suit you.
when buying a simple outgoing connection, calls are made from the general number of the PBX of this operator.

Answer 3

You can determine who called from an unknown phone number here - findmecaller.com/ru