1. A system for invoking a service, the system comprising: an invoking entity capable of sending a service invocation request to effectuate invocation of a service, the service invocation request being formatted and sent in accordance with a given messaging architecture; and a network entity capable of receiving the service invocation request, and sending a response to the service invocation request across a SIP (Session Initiation Protocol) architecture, the response including a payload formatted in accordance with the given messaging architecture, wherein the invoking entity is capable of sending the service invocation request independent of the SIP architecture.