SIP 181 Call Is Being Forwarded vs 204 No Notification
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 204 (No Notification) is a 2xx Success response. 181 indicates that a proxy server may send this to indicate that the call is being forwarded to a different set of destinations. In contrast, 204 means that the request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
الوصف
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
متى تراه
When the callee has call forwarding enabled and the request is being redirected to another number or device.
كيفية الإصلاح
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
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.
الفروق الرئيسية
181 is a 1xx Provisional response, while 204 is a 2xx Success response.
SIP 181: A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
SIP 204: The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
متى تستخدم أيًا منهما
For 181 (Call Is Being Forwarded): No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings. For 204 (No Notification): No fix needed. The subscription was accepted but there is no state change to notify about yet.