SIP 300 Multiple Choices vs 501 Not Implemented
SIP 300 (Multiple Choices) is a 3xx Redirection response, while 501 (Not Implemented) is a 5xx Server 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, 501 means that the server does not support the functionality required to fulfill the request. The method is recognized but not implemented.
説明
The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
このコードが表示される場合
When a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
解決方法
Select one of the provided Contact addresses and resend the request to that specific URI.
説明
The server does not support the functionality required to fulfill the request. The method is recognized but not implemented.
このコードが表示される場合
When the SIP method is valid but the server has not implemented it (e.g., INFO, UPDATE, PRACK on a basic server).
解決方法
Use a different method that the server supports. Check the Allow header in responses to see supported methods.
主な違い
300 is a 3xx Redirection response, while 501 is a 5xx Server 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 501: The server does not support the functionality required to fulfill the request. The method is recognized but not implemented.
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 501 when when the SIP method is valid but the server has not implemented it (e.g., INFO, UPDATE, PRACK on a basic server).
どちらをいつ使うか
For 300 (Multiple Choices): Select one of the provided Contact addresses and resend the request to that specific URI. For 501 (Not Implemented): Use a different method that the server supports. Check the Allow header in responses to see supported methods.