Which number will be used for calls?

For outgoing calls, the called person sees the phone number set in the CallerID. You can use virtual numbers connected in Zadarma for making calls.

To do this, you need:

• In your personal account, go to the Services → Order a Virtual Number section, select a country from the list and click "Buy" next to the desired city or destination;
• once the number is activated, got to the Settings → SIP Connection → CallerID section (or if you are using PBX, to the My PBX → Extensions → CallerID section) and select it for calls.

You can also select and connect a phone number via the website.