If you have a firewall on your router or modem, you might need to make a configuration change in order for your Biscotti to connect. This configuration change is often referred to as port forwarding.
Biscotti requires the following ports to be open:
UDP: 443 Public NTP Server
UDP & TCP: 5061, 4060 SIP Server Ports
TCP: 20000, 21000, 22000, 23000
TCP: 60000, 61000 Cloud Server Ports
If you’re connected to a network through your workplace or school, ask the network administrator to open the above ports used by Biscotti.
For information about how to open ports on your router, you can check the PCWintech Port Forwarding Guides for specific details.