Hello All,



Does anyone know of the simplest way to detect the following 2 condition
on a telephone line?



1.      When it is ringing
2.      When it is busy/off hook.



My output from the above circuit needs to be logic 1 when the conditions
are true and logic 0 when they are false.

The circuit must also conform to the proper specs for interfacing to the
phone line with regards to line isolation.







Regards,

Steve

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