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7/29/2019 Telecom Networks Lecture1
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http://en.wikipedia.org/wiki/Telephone7/29/2019 Telecom Networks Lecture1
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http://www.wisegeek.com/what-is-telephony.htm7/29/2019 Telecom Networks Lecture1
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http://searchnetworking.techtarget.com/definition/central-office7/29/2019 Telecom Networks Lecture1
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