1. To open the phone's web interface enter device's IP address in the URL bar of your browser.
To attain your phone's current IP address press the "C" button, and then the second line in the menu - IP.
In the menu select "SIP accounts" and then "Account 1"
Under "Account 1" enter the following information:
Display name: Your sip-number (for example 111111) from personal account
User name: Your sip-number (for example 111111) from personal account
Name: Your sip-number (for example 111111) from personal account
Password: Your password of internal PBX number from personal account
Server: sip.zadarma.com
Display name: Your internal PBX number (for example 1234-100) from personal account
User name: Your internal PBX number (for example 1234-100) from personal account
Name: Your internal PBX number (for example 1234-100) from personal account
Password: Your password of internal PBX number from personal account
Server: pbx.zadarma.com
To save changes click on Apply
2. If you experience difficulties with incoming calls, open "Main" tab, and enable the following:
NAT settings: STUN
STUN server: stun.zadarma.com