 communicating call related data from the CS domain to the IMS, enforcing CS redirection policy, and SO on. Media Gateway Control Function (MGCF): MGCF provides signaling interworking and control of the media between the CS domain and the IMS core network subsystem for VCC calls. The call termination procedures in the CS domain may involve an MGCF provided by another network operator, thus the provision of appropriate interworking extends to peering agreements between operators. 11.9.1.2.2 IMS-based FMC (Long-term) IMS has been envisioned as a unifying architecture for the various forms of wireline and wireless technologies. To facilitate FMC, various standards including TISPAN NGN7 Release land PacketCable8 2.0 are being used to augment the IMS architecture originally standardized by the 3GPP. Unlink UMA, IMS-based FMC can work well with any cellular technology (GSM, UMTS, and CDMA) and WiMAX. The long term goal of the industry at large is best shown in Figure 11.17. Figure 11.17 shows IMS as the amalgamation platform for fixed and cable networks, and also for WLAN (Wireless Local Area Network) like WiFi, WMAN (Wireless Metropolitan Area Network) like WiMAX, and WWAN (Wireless Wide Area Network) like mobile 3G/4G networks. 11.9.1.2.2.1 IMS in Wireless Domain The Common IMS initiative will assist in offering service continuity across several wireless access networks. The multimode devices that can work across various wireless access networks and networks Telecoms & Internet converged Services & Protocols for Advanced Networks (TISPAN) is a standardization body of ETSI (European Telecommunications Standards Institute). NGN (Next Generation Network) Release 1 was launched in December 2005 to provide open standards that industry can use as a reliable basis for the development and implementation of the first generation of NGN systems. 8 PacketCable is a CableLabs specification effort designed to support the convergence of voice, video, data, and mobility technologies. The PacketCable 2.0 adds support for SIP-based en