SIP 204 No Notification vs 501 Not Implemented
SIP 204 (No Notification) is a 2xx Success response, while 501 (Not Implemented) is a 5xx Server 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, 501 means that the server does not support the functionality required to fulfill the request. The method is recognized but not implemented.
الوصف
The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
متى تراه
When subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
كيفية الإصلاح
No fix needed. The subscription was accepted but there is no state change to notify about yet.
الوصف
The server does not support the functionality required to fulfill the request. The method is recognized but not implemented.
متى تراه
When the SIP method is valid but the server has not implemented it (e.g., INFO, UPDATE, PRACK on a basic server).
كيفية الإصلاح
Use a different method that the server supports. Check the Allow header in responses to see supported methods.
الفروق الرئيسية
204 is a 2xx Success response, while 501 is a 5xx Server Failure response.
SIP 204: The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
SIP 501: The server does not support the functionality required to fulfill the request. The method is recognized but not implemented.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
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).
متى تستخدم أيًا منهما
For 204 (No Notification): No fix needed. The subscription was accepted but there is no state change to notify about yet. For 501 (Not Implemented): Use a different method that the server supports. Check the Allow header in responses to see supported methods.