SIP 204 No Notification vs 485 Ambiguous
SIP 204 (No Notification) is a 2xx Success response, while 485 (Ambiguous) 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, 485 means that the Request-URI was ambiguous. The response body may contain a list of possible unambiguous addresses.
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 Request-URI was ambiguous. The response body may contain a list of possible unambiguous addresses.
何时出现
When the destination address matches multiple users and the server cannot determine which one is intended.
如何修复
Use a more specific SIP URI. Check the response body for a list of possible matches and select the correct one.
主要区别
204 is a 2xx Success response, while 485 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 485: The Request-URI was ambiguous. The response body may contain a list of possible unambiguous addresses.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 485 when when the destination address matches multiple users and the server cannot determine which one is intended.
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 485 (Ambiguous): Use a more specific SIP URI. Check the response body for a list of possible matches and select the correct one.