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I’m looking to create a windows application in vb.net or c#.net that will capture the phone number of incoming calls. This would be a land line. What would the hardware requirements be? Which .Net libraries would be used?
You’ll need a recent modem that supports Caller ID and is supported by Windows. Windows provides an API for talking to the modem called Telephony Application Programming Interface, a.k.a. TAPI. Unfortunately, this API cannot easily be accessed from managed code.
Your best bet for getting access to Caller ID in managed code would be to use one of the free or shareware TAPI OCX controls that sit on top of the TAPI API, most of them should have a simple API that would give you the incoming number. Google for something like ‘TAPI OCX’ or ‘TAPI Caller ID’ to see what’s available.