1. Download PortGo for Windows here.
2. Enter the following:
Username: Your sip number (for example 111111) from your personal account
Password: Your sip number password from your personal account
Server: sip.zadarma.com
Sign me in automatically: Check the box "Sign me in automatically" and click "Login"
Username: Your PBX extension number (for example 1234-100) from your personal account
Password: Your PBX extension number password from your personal account
Server: pbx.zadarma.com
Sign me in automatically: Check the box "Sign me in automatically" and click "Login"
3. The softphone status is "registered" and you can make calls.