该测试工具可以模拟多个SIP用户代理同时向SIP服务器发出呼叫，通过统计这些呼叫的处理情况来反映被测系统的性能。
The test tool simulates multiple SIP user agents to call the tested SIP server simultaneously and reflects the performance of the tested system by making statistic of the status of processed calls.
实践证明，对于呼叫中心这类复杂的非线性系统，使用统计学方法预测的效果并不理想。
Practice has proved that the predictive results of theses methods are not ideal for the complicate non-linear systems such as call centers.
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