SIP 181 Call Is Being Forwarded vs 415 Unsupported Media Type
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 415 (Unsupported Media Type) is a 4xx Client 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, 415 means that the server is refusing the request because the message body is in a format not supported by the server for the requested method.
Descrição
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
Quando você o vê
When the callee has call forwarding enabled and the request is being redirected to another number or device.
Como corrigir
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
Descrição
The server is refusing the request because the message body is in a format not supported by the server for the requested method.
Quando você o vê
When the Content-Type of the request body is not supported. For INVITE, this often means an unsupported SDP format.
Como corrigir
Check the Accept header in the response to see supported media types. Use a compatible Content-Type in your request.
Diferenças principais
181 is a 1xx Provisional response, while 415 is a 4xx Client 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 415: The server is refusing the request because the message body is in a format not supported by the server for the requested method.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 415 when when the Content-Type of the request body is not supported. For INVITE, this often means an unsupported SDP format.
Quando usar qual
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 415 (Unsupported Media Type): Check the Accept header in the response to see supported media types. Use a compatible Content-Type in your request.