: Supports G.729 and H.264 codecs for better quality on slower connections.
| Problem | Solution | | :--- | :--- | | | Go to Settings → Audio. Change the Wave In/Out devices to Windows Default or your specific USB headset. | | Registrar fails (408 Timeout) | Increase the Register Expires time to 3600 seconds. Also, disable "Use DNS SRV" if your provider doesn't support it. | | Crashes on Windows 11 | Run in Windows 7 compatibility mode AND as Administrator. Also, disable fullscreen optimizations. | | Cannot hear DTMF tones | Go to Settings → DTMF. Change from In-band to RFC 2833 (AVT). | | "Zoiper is not a valid Win32 application" | You downloaded a corrupt file. Re-download from a trusted source. | i--- Zoiper Classic 2.43 Download
Go to Options > SIP Accounts > Add New SIP Account . : Supports G
: Syncs with Outlook, LDAP, Thunderbird, and native OS contact lists. | | Registrar fails (408 Timeout) | Increase
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