摘要： 1. Call path1). VOIP call: MaxMobile =>VOIP = ==================>(net work)SIPService => LyncProxy => Lync Server => Lync Client2). (SIP call) Cell call: MaxMobile =>PSTN(Chunk call) =>运营商=> SIP Gateway(Net Work)=>SIPService2. What is pstn?http://zhidao.eepw.com.cn/ask/que 阅读全文