Caller ID

References:

http://www.compartir-tecnologias.es/call-id-y-c-ayuda-206872292.html

Code
http://www.codeproject.com/KB/dotnet/CShart_TAPI_3x.aspx
http://stackoverflow.com/questions/3128204/how-detect-caller-id-from-phone-line
http://www.forosdelweb.com/f29/modem-con-identificador-llamadas-caller-id-con-c-694795/
http://intellitechture.com/The-basics-of-System-IO-Ports-SerialPort/
http://www.tech-archive.net/Archive/Development/microsoft.public.win32.programmer.tapi/2006-06/msg00106.html
Test Modem
http://stackoverflow.com/questions/1200921/how-to-get-caller-id-in-c