This thesis researches and designs media gateway system ISAM-V, which can provide access and control functions for VoIP and has the ability to have smooth transition to the next generation network.
本文旨在设计研究媒体网关系统ISAM - V，使其能提供IP电话接入控制功能，并具备向下一代网络平滑过渡的能力。
With V- type body , even if in low flow rate or high viscosity media, it can also guarantee accuracy of control within framework .
具有一个V型阀体，即使在小流量或高粘度介质的情况下，也可在整个量程范围内，保证控制的精确性；
With V- type body , even if in low flow rate or high viscosity media, it can also guarantee accuracy of control within framework .
具有一个V型阀体，即使在小流量或高粘度介质的情况下，也可在整个量程范围内，保证控制的精确性；
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