433
SIP
433 Anonymity Disallowed
The request has been rejected because the server policy requires caller identification and the request was anonymous.
Когда вы видите этот код
When calling with caller ID suppressed (anonymous) to a server or destination that requires caller identification.
Как исправить
Remove the Privacy header or include proper caller identification. Some networks require valid From header identity.
Спецификация
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Руководства
401 Unauthorized vs 403 Forbidden: When to Use Each
Security & Authentication
SIP Response Codes: Understanding VoIP Call Flow
Real-Time Protocols
SIP Call Flow: Understanding Session Setup
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WebRTC Signaling with SIP and WebSocket
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RFC 3261: SIP Protocol Deep Dive
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TLS 1.3: Faster, Simpler, More Secure
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