详细描述了PJSIP协议栈中最底层使用的PJLIB库,其中关于OS无关的部分的实现使得PJSIP OS无关,具备了很高的可移植性-PJSIP detailed descr iption of the protocol stack used in the bottom PJLIB library, which has nothing to do on the OS part of the realization of making PJSIP OS has nothing to do with a