nt as needed for voice communications. The architecture supports the following capabilities: a. SLA-based resource management for subscribers; b. Multiple voice session for a particular subscriber; C. Simultaneous voice and data sessions; d. Prioritization of emergency voice calls and high-priority data sessions; 4. Interface with various interworking and media gateways, allowing delivery of legacy services translated over IP to WiMAX access networks; 5. Support delivery of IP broadcast and multicast services over WiMAX access networks. The following are the design considerations for WiMAX network security: 1. The security framework is agnostic to the operator type and ASN topology, and applies consistently across mobile WiMAX networks and internetworking deployment models and usage scenarios. 2. The architecture supports robust MS authentication based on the IEEE 802.16 standards security framework. 3. An MS is able to support all commonly deployed authentication mechanisms and authentication in home and visited operator network scenarios, based on a consistent and extensible authentication framework. Furthermore, an MS is able to select between various authentication methods based on NSP type. 4. Data integrity, replay protection, and confidentiality using applicable key lengths within the WiMAX access network are supported. 5. The use of MS initiated or terminated security mechanisms such as Virtual Private Networks (VPNs) is accommodated [8]. 6. Standard secure IP address management mechanisms between the MS and its home or visited NSP are supported [3]. 7. The privacy of MS and host's specific states, such as authentication state, IP host configuration, and service provisioning is guaranteed. 8. Group communications are exclusively limited to authorized group membership. Mobility and handover design considerations are as follows: 1. Inter-technology handovers, e.g., Wi-Fi, 3GPP, and 3GPP2, when such capability is enabled in multi-mode MS are supported. 2. Both IPv4- [9] or IPv6-based [10] mobility management