题目内容：
根据下列题干，回答题：Network managers have long awaited （ 1 ） voice-over-IP(VOIP)solutions. VOIP （ 2 ）ease network management and decreases costs 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（ 3 ） offices can save tremendous amounts of （ 4 ）in long distance phone bills, provided that solutiori de- livers POTS -like voice quality （ 5 ）the Internet.
请选择（ 1 ）处最佳答案
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