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How are DTMF tones recogonized at the central office with filters and digital logic ? how many filters are need ??
thank y answering me !!!12/02/2017
it is my university lecture chapter and my teacher ask me like that !!!! i can' t answer it !!!12/02/2017
Why does a pushbutton phone sometimes look like a DTMF unit but really reamin a pulse dialing unit ?
plese answer me !!! thanks12/02/2017
What is the hierarchy of swithing centers? WHy is there flexibility in the routing of calls via different levels of this hierarchy?
This my univrsity assignment !!! please answering me as fast as !! thanks12/02/2017
IT is my homework for me !!!10/02/2017