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| Problem | Solution | |-------------------------------------|------------------------------------------------------------------------------| | “Registration error: 408 Timeout” | Check firewall; try changing local SIP port to 5062 (avoid conflicts). | | No audio (one-way or missing) | Disable Windows “Allow applications to take exclusive control” in sound settings. | | Crash on Windows 10/11 | Run in Windows 7 compatibility mode (right-click executable → Properties). | | Forgets account after reboot | Run Zoiper as administrator once, set config file permissions (C:\ProgramData\Zoiper). |

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