The well-developed and technically mature portfolio of Network Migration products which covers a full range of layer 1 to layer 4 topologies is meeting all requirements for the delivery and the retention of reliable legacy services, their migration to next generation networks and the implementation of completely new service offerings. Our Circuit Emulation gateways combine the legacy TDM world with the efficiency of the packet network transport. Additionally, they offer the opportunity to introduce in parallel Carrier Ethernet services and thus, provide a smooth migration path for future service offerings.