The last part is the idea and method of SIP system, which is realized by VOCAL after analyzing and modifying its instruction and code.
最后详细介绍了通过对VOCAL结构和代码的分析与修改，利用VOCAL来实现SIP系统的思路和实现方法。
The last part is the idea and method of SIP system, which is realized by VOCAL after analyzing and modifying its instruction and code.
最后详细介绍了通过对VOCAL结构和代码的分析与修改，利用VOCAL来实现SIP系统的思路和实现方法。
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