How can i read data from com port.

From definity system (AT&T PABX) data coming to billing computer. I am trying to develop a telephone billing software. How can i read data from the COM port 1 and save it access or text file format?

Please help....

So far, no one replied me. Can someone help me!!!  

I want to get data from com port 1 and save it to access file then clear the buffer.

I want to develop telephone billing software. please help or give me some references?

I've never tried to read from com ports, but here's something that may help:

1) See if the MSComm1 control (MS COMM Control 6.0) can work. Never used it, but it may allow you to "listen" to different ports.

[from MSDN for an example]
PortOpen Property Example
The following example opens communications port number 1 at 9600 baud with no parity checking, 8 data bits, and 1 stop bit:

MSComm1.Settings = "9600,n,8,1"
MSComm1.CommPort = 1
MSComm1.PortOpen = True

2) lookup on the internet ways to communicate with a modem, it uses a comm port, so it may be of some use.