SIP
415 Unsupported Media Type
The server is refusing the request because the message body is in a format not supported by the server for the requested method.
Wenn Sie diesen Code sehen
When the Content-Type of the request body is not supported. For INVITE, this often means an unsupported SDP format.
Wie man es behebt
Check the Accept header in the response to see supported media types. Use a compatible Content-Type in your request.