1. Click on this link to download and install Jitsi.
After the launch enter the following:
Username: 111111@sip.zadarma.com, replace 111111 with your sip number from your personal account
Password: Your sip number password from your personal account
Username: 1234-100@pbx.zadarma.com, replace 1234-100 with your PBX extension number from your personal account
Password: Your PBX extension number password from your personal account
2. Select "Instruments", and then "Options".
3. Select your account and click "Edit"
4. Enter the following:
Authorization name: Your sip number (for example 111111) from your personal account
Proxy: sip.zadarma.com
Support method: REGISTER
DTMF method: RFC2833
Authorization name: Your PBX extension number (for example 1234-100) from your personal account
Proxy: pbx.zadarma.com
Support method: REGISTER
DTMF method: RFC2833
Click "Next"
5. If the settings were entered correctly, the status will appear as "Online"