1. Find and download Zoiper in the AppStore.
2. Launch Zoiper and click "Settings".
3. Click "Accounts".
4. Click on "+" to add an account, specify that you have an account and select "Manual configuration".
5. Click on " SIP Accounts".
6. Enter:
Account name: Your sip-number (for example 111111) from your personal account
Domain: sip.zadarma.com
Username: Your sip-number (for example 111111) from your personal account
Password: Your sip-number password from your personal account
Click "Register"
Account name: Your PBX extension number (for example 1234-100) from your personal account
Domain: pbx.zadarma.com
User name: Your PBX extension number (for example 1234-100) from your personal account
Password: Your PBX extension number password from your personal account
Click "Register"
7. Application is now set up, and you can make calls.