SIP 204 No Notification vs 405 Method Not Allowed
SIP 204 (No Notification) is a 2xx Success response, while 405 (Method Not Allowed) is a 4xx Client Failure response. 204 indicates that the request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request. In contrast, 405 means that the method specified in the Request-Line is not allowed for the address identified by the Request-URI.
描述
The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
何时出现
When subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
如何修复
No fix needed. The subscription was accepted but there is no state change to notify about yet.
描述
The method specified in the Request-Line is not allowed for the address identified by the Request-URI.
何时出现
When sending a SIP method (e.g., MESSAGE, PUBLISH) that the server does not support for the target URI.
如何修复
Check the Allow header in the response to see which methods are supported. Use a supported method instead.
主要区别
204 is a 2xx Success response, while 405 is a 4xx Client Failure response.
SIP 204: The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
SIP 405: The method specified in the Request-Line is not allowed for the address identified by the Request-URI.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 405 when when sending a SIP method (e.g., MESSAGE, PUBLISH) that the server does not support for the target URI.
何时使用哪个
For 204 (No Notification): No fix needed. The subscription was accepted but there is no state change to notify about yet. For 405 (Method Not Allowed): Check the Allow header in the response to see which methods are supported. Use a supported method instead.