2. 计算机
  3. Network managers have long awaited practical voice-over-IP(VOIP)solutions. VOIP promises ease network management and decreases(6

Network managers have long awaited practical voice-over-IP(VOIP)solutions. VOIP promises ease network management and decreases(6

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问题 Network managers have long awaited practical voice-over-IP(VOIP)solutions. VOIP promises ease network management and decreases(66)by converging a company’s telephony and data infrastructures into one network. And a VOIP solution implemented at a company’s head-quarters with far-reaching branch offices can(67)tremendous amounts of money in long distance phone bills, provided that solution delivers POTS-like voice(68)over the Internet.
    VOIP gateways are designed to convert voice from the(69)domain to the circuit switched domain. VOIP solutions use a digital signal processor(DSP)to process the voice data, preparing the voice sample for transmission by compressing voice and removing jitter. The VOIP equipment must comply with the(70)H.323 standard defined by the International Telecommunication Union, or ITU.
选项 A、H.320
B、H.322
C、H.323
D、H.324
答案C
解析 网络经理对通过IP网传输声音(VOIP)的实用解决方案等待已久。VOIP允诺通过把公司的电话和数据基础设施合并成一个网络来简化管理和降低成本。在公司总部和远方分公司中实现的 VOIP解决方案，如果能在因特网上传送与普通电话相似的话音质量，就可以大大节省长途电话费用。
   VOIP网关设计成把话音从包方式转换成电路的交换方式。VOIP解决方案采用了一个数字信号处理器(DSP)处理话音数据，通过压缩话音和去除抖动来制造供传输用的话音取样。VOIP设备必须符合国际电信联盟(ITU)定义的H.323标准。
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