Method of providing dialtone first on step by step telephone...

Details Method of providing dialtone first on step by step telephone... Method of providing dialtone first on step by step telephone...

H - Electricity

04

M

379/36, 344/1.91

H04M 3/02 (2006.01) H04Q 1/44 (2006.01)

Patent

CA 1026446

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