Configuring ISDN and Leased Line Connections 2-41WAN SetupLine Configuration...Connection Profiles...Default Answer Profile...From here you will configure yours and the remote sites' WAN information.1. Select Default Answer Profile in the WAN Setup screen. PressReturn. The Default Profile screen appears.2. To enable CNA authentication, select Calling NumberAuthentication in the Default Profile screen and choose one ofthe following settings:Ignored: Calling Number Authentication (CNA) is not in effect.This is the default setting.Preferred: Authentication is attempted if the calling number isavailable. If authentication fails, or the calling number is notavailable, the call proceeds as usual and the caller may stillconnect successfully. Use this setting if you expect to receiveboth regular and CNA-authenticated calls.Required: Authentication is attempted if the calling number isavailable. If authentication fails, or the calling number is notavailable, the Netopia Router disconnects the caller. Use thissetting if you require all calls to be CNA-authenticated.Calling Number Authentication (CNA), is an application ofCallerID. It is a method of verifying that an incoming call isoriginating from an expected site. Using CNA, you can increasethe security of your network by requiring that callers not onlypossess the correct PPP authentication information, but also arecalling from a particular physical location.CNA works by matching the actual calling number to the numberentered in the Calling Number field in the answering side’sconnection profile. When a match occurs, the incoming call ishandled by the connection profile containing the matchednumber.
