Kaspersky

1. Open Kaspersky
2. Select 'Settings from the 'Tools' menu
   
3. Click on 'Firewall' under 'Protection'
4. Click on 'Settings' under 'Filtration system'
5. Find 'FastVoip' in the 'Rules for Applications' table
6. Set permission by choosing a (custom) template
7. Click 'Apply', then click 'OK'

Firewall

• AVG
• Avira
• Kaspersky
• McAfee
• Norton
• ZoneAlarm