4. XP Configuration
You will experience problems with receiving calls if you have XP and are using the built in firewall.
To correct this problem and allow I/Talk to receive calls, following the procedure below:
Step 1: Go to the Control Panel and choose Connections. Click on the connection you are using to access the internet.

Step 2: Click on the Advanced tab:

Step 3: Click on the Settings button:

Step 4:Click the Add Button

Step 5: Enter the information requested. You must enable TCP Ports 13000 through 13005.

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