403
SIP
403 Forbidden
The server understood the request but is refusing to fulfill it. Authorization will not help. The request should not be repeated.
Cuándo verás este código
When the server policy denies the request regardless of credentials. Common for blocked numbers, restricted routes, or ACL violations.
Cómo solucionarlo
Check server ACLs and routing policies. Verify the caller is permitted to make this type of call. Contact the server administrator if the block is unexpected.
Especificación
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Equivalentes entre protocolos
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Guías
401 Unauthorized vs 403 Forbidden: When to Use Each
Security & Authentication
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Real-Time Protocols
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Protocol Deep Dives
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Protocol Deep Dives
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