SIP 181 Call Is Being Forwarded vs 501 Not Implemented
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 501 (Not Implemented) is a 5xx Server Failure 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, 501 means that the server does not support the functionality required to fulfill the request. The method is recognized but not implemented.
Beschreibung
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
Wann Sie es sehen
When the callee has call forwarding enabled and the request is being redirected to another number or device.
Wie man es behebt
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
Beschreibung
The server does not support the functionality required to fulfill the request. The method is recognized but not implemented.
Wann Sie es sehen
When the SIP method is valid but the server has not implemented it (e.g., INFO, UPDATE, PRACK on a basic server).
Wie man es behebt
Use a different method that the server supports. Check the Allow header in responses to see supported methods.
Wesentliche Unterschiede
181 is a 1xx Provisional response, while 501 is a 5xx Server Failure response.
SIP 181: A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
SIP 501: The server does not support the functionality required to fulfill the request. The method is recognized but not implemented.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
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).
Wann welchen verwenden
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 501 (Not Implemented): Use a different method that the server supports. Check the Allow header in responses to see supported methods.