Support for transport and diversity buffers displaced in time for the media streaming over a network

A method of recovering media data, the method comprising: using a unit proxy (818, 1218): obtaining mapping information that maps an identifier for media data to a location of resources based on a service to retrieve media data, wherein the service defining at least one of a plurality of types of transport to transport the media data; receiving a request for media data from a client application services (802, 1202); determining whether the service is available; and if the service is available, make the client application service receives data media unit (808, 1208) receiving the media data using the service resource allocation, based on the mapping information.