Methods, systems, and computer programs for configuring a network functions virtualization orchestrator (NFVO). In one aspect, a method can include actions of generating, by one or more computers, a message that includes data representing a request to upload a virtual network function (VNF) package, encoding, by the one or more computers, the generated message that includes the VNF package for transmission to a network functions virtualization orchestrator (NFVO), and transmitting, by the one or more computers, the encoded message to the NFVO.