I connected a virtual number for a client to track calls from advertising sources (Direct/Adwords). This allows me to see the number of calls on specific days, as well as the numbers and duration of each call. Of course, it would be great to have the ability to listen to these calls, like in Chaser :) But for such a low price, the service is completely justified. The cost of one minute is 0.95 rubles, and if the call lasts less than a minute, a correspondingly smaller amount is charged. There is also the option to export call statistics to Excel. The system is very simple and convenient to use.