The Session Initiation Protocol (SIP) introduced by IETF has flexible and easy deployment features to solve the MN's global mobility problem.
IETF提出的SIP协议以其灵活、容易部署等特性较好地解决了移动节点的全局移动性问题。
By this algorithm, the most suitable network for each session can be selected according to network load conditions, service attribute, mobility and different locations of terminal.
该算法在进行网络选择时不仅考虑到网络的负载情况，还充分考虑了发起会话的业务属性、终端的移动性以及终端在网络中所处位置的不同。
Moreover, when performing a session handover between terminals which are mobility-managed by separate Mobile IP HA, it is impossible to normally handle an Uplink packet by the IETF standard technique.
另外，当在其移动性由各个移动IP HA管理的终端之间执行会话移交时，很难使IETF标准正常地应对上行链 路分组。
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