With the explosion of wireless broadband options, cellular providers are evolving into VoIP companies.
随着无线带宽选择的膨胀，移动电话运营商正在演化为IP电话公司。
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The article, depending on the interception standard of ETSI standard, studies the interception of the wireless telecommunications, VOIP system based on SIP and IP network.
It is a global provider of complete customer contact solutions that support multiple channels, including voice, E-mail, web, wireless and VoIP, through a unique open interaction infrastructure.