1. Open Options menu.
2. Open "Profiles" tab.
3. Create new profile.
4. Profile options.
Sip Proxy.
Proxy domain: empty : 0 User domain: sip.diamondcard.us
Register with proxy. Unchecked Proxy is strict outbound. Unchecked
Advanced options. Use separate registrar. Unchecked Unregister contact address only. Checked
Proxy for NAT: empty
5. While saving profile enter your Account Id and Pin code on prompt.
6. Now you can dial regular phone numbers. Numbers should be dialed in international format. E.g. "18002001000" for USA +1800-200-1000 number. More information how to dial numbers available here.