SIP 300 Multiple Choices vs 400 Bad Request
SIP 300 (Multiple Choices) is a 3xx Redirection response, while 400 (Bad Request) 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, 400 means that the request could not be understood due to malformed syntax. The client should not repeat the request without modifications.
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 request could not be understood due to malformed syntax. The client should not repeat the request without modifications.
このコードが表示される場合
When the SIP message has syntax errors, missing required headers, or invalid header values.
解決方法
Review the SIP message for syntax errors. Check required headers (To, From, Call-ID, CSeq, Via, Max-Forwards) and ensure proper formatting.
主な違い
300 is a 3xx Redirection response, while 400 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 400: The request could not be understood due to malformed syntax. The client should not repeat the request without modifications.
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 400 when when the SIP message has syntax errors, missing required headers, or invalid header values.
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 400 (Bad Request): Review the SIP message for syntax errors. Check required headers (To, From, Call-ID, CSeq, Via, Max-Forwards) and ensure proper formatting.