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Service restoration technique for telecommunications facilities

Telephonic communications – Plural exchange network or interconnection – Connection call model
Patent

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Switching system reliability

Telephonic communications – Plural exchange network or interconnection – Connection call model
Patent

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System and method for call-by-call source routing with rule-base

Telephonic communications – Plural exchange network or interconnection – Connection call model
Patent

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System and method for providing local number portability service

Telephonic communications – Plural exchange network or interconnection – Connection call model
Patent

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System and method for safely and efficiently redirecting a telep

Telephonic communications – Plural exchange network or interconnection – Connection call model
Patent

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System and method for virtual wireless calling

Telephonic communications – Plural exchange network or interconnection – Connection call model
Reexamination Certificate

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System for converting a No. 5 crossbar telephone switching centr

Telephonic communications – Plural exchange network or interconnection – Connection call model
Patent

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