If you want to know how many people use the phone numbers that you publish on your .TEL name, you can subscribe to a service called “remote call forwarded phone number” or “market extension line” AKA “market expansion line”. 
Most phone companies offer this service, which gives you a tracking phone number that you put into .tel.
Here is a description of remote call forwarding as provided by my Canadian phone company, as well as a description of market expansion line from a major American phone company.
When somebody uses that number, the call is forwarded to your actual line, but call duration and the total number of calls is tracked by the phone company. You then get a report with all the data to demonstrate how your .tel phone line is working.
If your phone company does not provide the service you need, you can also set up a tracking line forwarded to a toll-free number. This should provide you with similar data. While most phone companies will charge for the tracking number service, it’s typically a small fee.
We hope that using these tools will provide you a clearer picture of the volume of calls coming from your .TEL name.
Superbook is the new iPhone address book application that leverages .TEL to connect you with your contacts instantly.
I am going to start by admitting outright that I haven’t tried this new .tel service yet. I am typically relunctant to fork over my login and password details to anything; that said, the concept behind