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In this paper, we propose a scalable domain-level call admission control (CAC0 algorithm supporting a novel dynamic reservation method in mobile IP (MIP) enable Internet. MIP tunnels enable for a mobile node to move to another subnet on a session. In order to prevent a service quality from being degraded in MIP networks, it is necessary to deliberate the quality of service (QoS) provisioning on the MIP tunnels especially for roaming mobile nodes (MNs) to foreign networks Our CAC algorithm keeps a handoff dropping probability (HDP) below a pre-defined value without regard to overloads of mobility agents (MAs). Our proposed scheme uses the number of calls that will be handed off from neighboring MAs and the number of calls in the current MA. We assume that each class has both a HDP and a desired bandwidth. The proposed admission control algorithm can be expanded to serve not only single class but also multi-class with different QoS requirements. Furthermore, we introduce an aggregated dynamic resource allocation method to reflect incoming call patterns and to reduce the number of reservation signals for the tunnels which can cause the increase in network traffics and the data loss during the handoff processing. We show that our scheme guarantees the given HDP and reduces the number of reservation signals comparing trunk reservation methods.