This invention makes it possible to transparently test replacement functionality and optionally migrate subscribers on analog phone lines, served, for example, by PSTN Class 5 elements, to Next Generation Network (NGN) elements when copper co-termination is leveraged. The method and apparatus mechanizes replacement continuity verification to the NGN element from the analog dial tone port and the multi-element network changes required for real time per line per-migration, operational testing and optional migration to the NGN element. All of the network elements are accessible from a single device, the Control Computer used by this invention. Each line can be transparently tested and optionally migrated during a short time period when the subscriber is not using the analog line. In effect, this testing and optional migration is actually changing the state of the NGN element to operational for test purposes and if the tests pass, the analog port and associated DSLAM port can be optionally deactivated. This activity is accomplished in real time, with minimal service interruption to the subscriber. Support and routing databases may also be updated concurrently.