multiple telephone extension control from single line

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seaspac

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multiple telephone extensions

i m working on a pabx like system to make telephone extensions able to access limited facilities. when only one phone line available. also to monitor and log all the activity. like speech recording, timing, dialed and recieved calls.
i m using 89c51 for this purpose and a pc connected by serial link for this purpose.
any body has done work on it or have any ideas plz share.
 

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