How to control if there was a call on the affiliate CPA affiliate phone?

Question

Marketing

The question is about CPA affiliate programs .
I want to ask who is tracking how: was there a call on the affiliate phone with an extension number or was it not?
For example, I personally track the transition through affiliate links for the purposes of Yandex metrics, goo.gl statistics, and there are also various trackers. But what about the phone?

Answer 1

Set up a telephony server and use it to send traffic to the affiliate number. Minus - you need to use your numbers and administer the server. Plus, you can do anything with traffic, including transferring it to another offer, if the first one is shaved. But no one canceled the analysis according to statistics.

Answer 2

call

Answer 3

What does affiliate phone mean? The topic is not open.
Where are you sending traffic? Are you driving traffic or are they driving it to you with CPA?

Answer 4

I drive traffic. The CPA gives the affiliate phone number with an extension. Money is paid for each application by phone. The question is how can I track whether the call was made or not? What ways.