SIP 204 No Notification vs 300 Multiple Choices
SIP 204 (No Notification) is a 2xx Success response, while 300 (Multiple Choices) is a 3xx Redirection response. 204 indicates that the request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request. In contrast, 300 means 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.
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 address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
何时出现
When a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
如何修复
Select one of the provided Contact addresses and resend the request to that specific URI.
主要区别
204 is a 2xx Success response, while 300 is a 3xx Redirection response.
SIP 204: The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
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.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 300 when when a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
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 300 (Multiple Choices): Select one of the provided Contact addresses and resend the request to that specific URI.