If calls aren't transferring to your phone in the Zoiper web app when your team doesn’t answer, first check your call forwarding or failover settings in your PBX or VoIP provider's portal. Ensure your extension or phone number is correctly set as the fallback option. Also, verify that your Zoiper app is properly registered and has a stable internet connection. Check for any firewall or NAT issues that might block call forwarding. If everything looks correct, try reinstalling or updating the Zoiper app. Finally, contact your VoIP provider’s support to verify server-side call routing settings.