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Home › Method and apparatus for providing forwarding on ring-no-answer for remote telephone extensions using voice over packet-data-network systems (VOPS)

Method and apparatus for providing forwarding on ring-no-answer for remote telephone extensions using voice over packet-data-network systems (VOPS)

US Patent 7009962 · Granted Mar 7, 2006

Estimated economic value: $61,657,000 ⓘ

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