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Subject: dial tone, calling ring and busy signal detection

Date: 11/26/02 at 6:45 PM
Posted by: gilbert bautista
E-mail: noobtobias@yahoo.com
Message Posted:

i am currently working a project wherein it would dial telephone numbers and play a certain message for notification. i need a circuit to detect the dial tone, the calling ring (the audible ring when you call somebody) and the busy signal conditions so that i could use them as inputs to my microcontroller so that the status of the party being called could be determined.

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