1. Click on this link to download and install Jitsi.
After launch enter the following:
Username: email@example.com 111111 with your sip number from personal account
Password: Your sip number password from personal account
2. Click on "Instruments", and then on "Options".
3. Choose your account and click on "Edit"
4. Enter the following:
Authorization name: Your sip number (for example 111111) from personal account
Support method: REGISTER
DTMF method: RFC2833
5. If settings were entered correctly, status will appear as "Online"
When connecting to IP PBX from Zadarma you need to use the internal IP PBX information that appears under "My PBX - Extension numbers".
Replace 1234-100 with your internal PBX number from personal account
Password: Your password of internal PBX number from personal account
Authorization name: Your internal PBX number (for example 1234-100) from personal account