The pertinent settings for ensuring your connection is setup right are as follows: 

Control Panel and Network 

1. Double-click  'My Computer' and then 'Control Panel' and then 'Network'.
2. You should see (at least) Dialup Adapter and TCP/IP under installed network components. If you don't see them, you will need to add:
• Under Adapters: 
• Microsoft ..............Dialup Adapter
• Under Protocols: 
• Microsoft ..............TCP/IP
3. Double-click on TCP/IP. This will show you the properties of the TCP/IP stack. Each tab is labeled below with the setting needed.  

NOTE: RTC Communications has chosen to use Dial-Up Networking to establish the tcpip and dialup settings. For this reason, the networking components in Control Panel, Network should all contain null settings. 

1. IP Address: Obtain an IP address automatically 
2. DNS Configuration: Disable 
3. WINS Configuration: Disable (or use DHCP for WINS resolution) 
4. Gateway: empty 
5. Bindings: empty 
6. Advanced: none 
7. NetBIOS: unchecked

1. Now that 'Control Panel' and 'Network' is setup correctly, the Dial-Up Networking can be configured. Open 'My Computer' and then "Dial-Up Networking'. You should see an icon labled rtccom.net. Right click on it with the right mouse button and choose Properties from the pop-up menu.
2. Choose Server Types.
3. There should only be two checks on this window. Enable software compression and TCP/IP. Uncheck everything else. 
4. Click the TCP/IP Settings button.
5. The first option with a dot next to it should be 'Server assigned IP address'
6. Server assigned name server addresses should NOT be checked with a dot
7. Specify name server address should be checked with dot.
8. The Primary DNS is 206.160.240.34
9. There is no secondary. Leave it blank.
10. Use IP header compression should be checked.
11. Use default gateway on remote network should be checked.