This is the tenth part of the Chatterbox series. For your convenience you can find other parts in the table of contents in Part 1 – Origins
First, register a phone number in Zadarma. Obviously, you need to pay for a subscription or whatever works for you.
Second, we use SipCLI with the following command:
sipcli.exe 123456789 -l 3 -u USERNAME -p PASSWORD -d sip.zadarma.com -o 25
It tries to call you for 25 seconds and then drops the call. Now, important thing is – you don’t pick up. This way it’s effectively free of charge (obviously you need to keep your Zadarma account active).