1. Find and download SipDroid from GooglePlay.
2. After the successful installation enter the application's settings.
3. Select the SIP account
4. Enter the following:
Login: Your sip-number (for example 111111) from your personal account
Password: Your sip-number password from your personal account
Server: sip.zadarma.com
Login: 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
5. If the indicator in the top left corner of the screen is green, the application is set up correctly and you can make calls.