504
SIP
504 Server Time-out
The server did not receive a timely response from an external server it accessed while attempting to process the request. Different from 408 (client timeout).
Cuándo verás este código
When a proxy's request to a downstream server times out. The proxy itself is working, but the next hop is unresponsive.
Cómo solucionarlo
Check the downstream server's availability. Verify DNS resolution for the next-hop domain. Consider adjusting transaction timeout values.
Especificación
Equivalentes entre protocolos
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Guías
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
Real-Time Protocols
WebRTC Signaling with SIP and WebSocket
Real-Time Protocols
RFC 3261: SIP Protocol Deep Dive
Protocol Deep Dives
TLS 1.3: Faster, Simpler, More Secure
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