Ad Hoc Networks provide a real opportunity to design flexible networks, very simple to deploy. However they remain a particular computation environment, characterized by the deficiency of pre-existed and centralized infrastructure. In the other hand, SIP protocol, which knows a huge booming in internet networks, requires centralized entities, like proxy server, registrar server and location service; consequently SIP is not adapted to Ad Hoc networks. We have presented in a new technique VNSIP (Virtual Network for Session Initiation Protocol) to fix the problem related to constraints of SIP deployment in MANET (Mobile Ad Hoc Networks). In this paper we use a new algorithm which we have called MCAC (MANET Call Admission Control) to improve VNSIP Performances
Ad Hoc网络提供了一个真正的机会来设计灵活的网络，非常容易部署。然而，它们仍然是一个特定的计算环境，其特点是缺乏预先存在的和集中的基础设施。另一方面，在互联网网络中蓬勃发展的SIP协议需要集中的实体，如代理服务器、注册服务器和位置服务;因此，SIP不适合Ad Hoc网络。我们提出了一种新的技术VNSIP(虚拟网络会话发起协议)来解决在MANET(移动自组织网络)中SIP部署的限制问题。在本文中，我们使用了一种新的算法，我们称之为MCAC (MANET Call Admission Control)来提高VNSIP的性能
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