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Detecting phone line various states

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taskmn57

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Hi All,
I am designing a circuit which want to
record phone line conversations using microcontroller
I need to detect line busy, free line,on hook or
off hook line status.
Is there any circuit or information for
these line states?
Is there any software algorithms
which I can use in my microcontroller firmware
for this purpose?
I would appreciate any help?
Thanks in advance,
Hossein
 

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