Being an ONVIF camera, you may be able to find out the RTSP stream URL by using ONVIF Device Manager. I've used this a couple of times for other Manufacturer's cameras, but haven't specifically tried it on the Cisco 6400.
Wayne -- Please remember to mark helpful responses and to set your question as answered if appropriate.
I use the software "Onvif Device Test Tool", but when i test the camera the response is " Sender not authorized". The user and password is correct. " <SOAP-ENV:Body> <SOAP-ENV:Fault> <SOAP-ENV:Code> <SOAP-ENV:Value>env:Sender</SOAP-ENV:Value> <SOAP-ENV:Subcode> <SOAP-ENV:Value>ter:NotAuthorized</SOAP-ENV:Value> </SOAP-ENV:Subcode> </SOAP-ENV:Code> <SOAP-ENV:Reason> <SOAP-ENV:Text xml:lang="en">Sender not authorized</SOAP-ENV:Text> </SOAP-ENV:Reason> </SOAP-ENV:Fault> </SOAP-ENV:Body> </SOAP-ENV:Envelope>"