My VoixeXML dialog does a consultation transfer (<transfer type="consultation"/>).
Everything works fine if the called party answers the call. When the destination is busy, I only
get error code 'unknown' but I would expect return code 'busy'.
Speech Server reports event "...Microsoft.SpeechServer.TelephonyException: A SIP request has failed, but no response code was received. The current operation is 'Opening'. The session state is 'Disconnected'. The remote participant
But my SIP logs tell me that out dialogic media gateway sent back the correct SIP response "SIP:Response: SIP/2.0 486 Busy Here".