The appliance can be configured to use another proxy server for filling RTSP requests. The relationship created between the appliance and the other server is similar to the CERN hierarchical relationship for HTTP requests. However, only one parent is supported.
This feature is useful for getting streaming requests through some firewalls as explained in Going Through an RTSP Proxy on the Firewall Network Address Translator (NAT).
It can also be used to create simple hierarchies of appliances or to enable the appliance to leverage streaming proxies on the Web.
To create an upstream proxy for the appliance, see Enable Upstream Proxy under Streaming Tab.