This module is meant to eventually offer generic support for premise routers when used by providers to offer sip/voip service to a subscriber. it offers rtp proxying and routing based on the assumption that all calls will be handed off to an external voip provider and automatic rtp proxy bridging between a subscribers local subnet and an isp. in theory this would be deployed in an isp supplied premise router to enable a local user to subscribe a series of local softphone/sip devices with a remote voip service provider.