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四年前被朗讯遗弃的Avaya，不但首次实现了全年盈利，而且已成为IP语音通信市场上的领先企业，它如何成功地实现大逆转?
Avaya abandoned by Lucent four years ago not only made its full-year profitability for the first time, but has also become a leader in the IP telephony market. How has it successfully reversed?