| | 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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Zoiper is a softphone application that turns your computer into a telephone. It allows you to make and receive calls over the internet using SIP (Session Initiation Protocol) or IAX (Inter-Asterisk eXchange) protocols. Unlike Skype or Zoom, Zoiper is designed to work directly with your VoIP provider (such as Asterisk, FreePBX, 3CX, or any SIP server). | | Forgets account after reboot | Run