SIP 300 Multiple Choices vs 482 Loop Detected
SIP 300 (Multiple Choices) is a 3xx Redirection response, while 482 (Loop Detected) 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, 482 means that the server has detected a loop. The request was received with its own address in the Via header, indicating it has been forwarded back to itself.
Описание
The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
Когда вы это видите
When a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
Как исправить
Select one of the provided Contact addresses and resend the request to that specific URI.
Описание
The server has detected a loop. The request was received with its own address in the Via header, indicating it has been forwarded back to itself.
Когда вы это видите
When routing configuration causes a request to cycle between two or more proxies without reaching the callee.
Как исправить
Review proxy routing tables and DNS records. Check for circular references in SIP routing. Fix the routing configuration to break the loop.
Ключевые различия
300 is a 3xx Redirection response, while 482 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 482: The server has detected a loop. The request was received with its own address in the Via header, indicating it has been forwarded back to itself.
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 482 when when routing configuration causes a request to cycle between two or more proxies without reaching the callee.
Когда что использовать
For 300 (Multiple Choices): Select one of the provided Contact addresses and resend the request to that specific URI. For 482 (Loop Detected): Review proxy routing tables and DNS records. Check for circular references in SIP routing. Fix the routing configuration to break the loop.