While movie heroes make landing out-of-control airliners look almost effortless, AT&T Inc. (T) and some other telcos are struggling just to pull their standalone VoIP services out of a revenue nosedive.The latest indication of an adjusted VoIP flight plan was the recent revelation (first reported by xchange) that AT&T has stopped taking new orders for its 4-year-old, public Internet-based CallVantage VoIP ... (555 words)

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