Abstract: A replacement or augmentative node device is added as an adjunct to an existing node device in a manner that is transparent to the remaining nodes of the network and that avoids disruption of network services. The existing node device (“host”) and the replacement or augmentative (“adjunct”) device each maintain the point code of the host for communication with other nodes of the network. For communication between the host and the adjunct, the adjunct maintains a unique adjunct point code. A manner of replacing a node device that does not cause disruption of network services is achieved by providing the replacement device as an adjunct to an original node device. Linksets joining network nodes to the original device are then migrated to the replacement device in any order that avoids disruption of network services.