SIP 204 No Notification vs 486 Busy Here
SIP 204 (No Notification) is a 2xx Success response, while 486 (Busy Here) 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, 486 means that the callee's end system was contacted successfully but the callee is currently not willing or able to take additional calls at this end system.
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 callee's end system was contacted successfully but the callee is currently not willing or able to take additional calls at this end system.
متى تراه
When the callee is already on a call and does not have call waiting. The user explicitly rejected the call, or all lines are in use.
كيفية الإصلاح
Wait and try again later. The callee may become available when their current call ends. Consider leaving a voicemail if available.
الفروق الرئيسية
204 is a 2xx Success response, while 486 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 486: The callee's end system was contacted successfully but the callee is currently not willing or able to take additional calls at this end system.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 486 when when the callee is already on a call and does not have call waiting. The user explicitly rejected the call, or all lines are in use.
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 486 (Busy Here): Wait and try again later. The callee may become available when their current call ends. Consider leaving a voicemail if available.