Some local PBX switches will not allow local or long distance calls without first entering an access code.
Some switches also require an access code after the number has been dialed.
The use of calling card rules in Telephony will allow Dial-Up Networking to dial these access codes to reach outside lines. Windows NT Server 4.0 with Service Pack 4 and Windows 98 Click Start, point to Settings, and click Control Panel. Double-click the Telephony icon. On the My Locations tab, click Calling Card. When the Calling card box appears, click New and give the card a name.