Multiple URIs in the EDS : When more than a URI is indicated by a VOP participant in the EDS, which URI should be used by the Requesting PSP? Which policy should be used to select the URI?

Priority 1 URI should always be used by the Requesting PSP as the “default” URI. 
URI(s) with lower priorities may be used e.g. as alternative backup reachability endpoints, in case Priority 1 URI is not reachable.  
Please note that all VOP Rulebook provisions apply to every individual VOP request including the one related to the maximum execution time, regardless of the used URI