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Zhang Y. SIP-based VoIP network and its interworking with PSTN. Electronics & Communication Engineering Journal, 2002. 273锝�282. 4. Goode B. Voice over Internet protocol 锛圴oIP锛�. Proc. of the IEEE, 2002 5. IP2022 Internet Processor User顒� Manual http://www.ubicom.com 6. TLV320AIC10 Data Sheet. http://218.19.77.199:8001/download.php 7. 鍜稿环鍋� ,瀛粊绁� ,姣涚惁銆傚熀浜嶮PLS锛堝鍗�(xi茅)璀版(bi膩o)瑷樹氦鎻涙妧琛�(sh霉)锛夌殑IP QoS鎳�(y墨ng)鐢�.寰▓(j矛)绠楁(j墨)淇℃伅,2003,锛�08锛�