SIP 300 Multiple Choices vs 403 Forbidden
SIP 300 (Multiple Choices) is a 3xx Redirection response, while 403 (Forbidden) is a 4xx Client Failure response. 300 indicates that the address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint. In contrast, 403 means that the server understood the request but is refusing to fulfill it. Authorization will not help. The request should not be repeated.
Descripción
The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
Cuándo lo verás
When a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
Cómo solucionarlo
Select one of the provided Contact addresses and resend the request to that specific URI.
Descripción
The server understood the request but is refusing to fulfill it. Authorization will not help. The request should not be repeated.
Cuándo lo verás
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.
Diferencias clave
300 is a 3xx Redirection response, while 403 is a 4xx Client Failure response.
SIP 300: The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
SIP 403: The server understood the request but is refusing to fulfill it. Authorization will not help. The request should not be repeated.
You encounter 300 when when a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
You encounter 403 when when the server policy denies the request regardless of credentials. Common for blocked numbers, restricted routes, or ACL violations.
Cuándo usar cada uno
For 300 (Multiple Choices): Select one of the provided Contact addresses and resend the request to that specific URI. For 403 (Forbidden): 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.