Netopia R2020 - Manual (Page 81)

Managing Data Calls 8-5
1. Select Default Answer Profile in the WAN Configuration screen. Press Return. The Default Profile screen
appears.
2. To enable CNA-authentication, select Calling Number Authentication in the Default Answer Profile screen
and choose one of the following settings:
Ignored: Calling Number Authentication (CNA) is not in effect.
Preferred: This is the default setting. Authentication is attempted if the calling number is available. If
authentication fails, or the calling number is not available, the call proceeds as usual and the caller may
still connect successfully. Use this setting if you expect to receive both regular and CNA-authenticated
calls.
Required: Authentication is attempted if the calling number is available. If authentication fails, or the
calling number is not available, the Netopia Router disconnects the caller. Use this setting if you require all
calls to be CNA-authenticated.
Calling Number Authentication (CNA), is an application of CallerID. It is a method of verifying that an
incoming call is originating from an expected site. Using CNA, you can increase the security of your network
by requiring that callers not only possess the correct PPP authentication information, but also are calling
from a par ticular physical location.
CNA works by checking the calling number that the Netopia Router receives during the initial setup phase
of an incoming call against a set of stored numbers. Each number in the stored set is defined in a specific
connection profile. When a match occurs, the incoming call is handled by the connection profile containing
the matched number.
Using CNA can also provide cost savings because calls are not billed during the CNA phase. With CNA, a
caller can set up a connection to the Netopia Router without incurring any charges by accessing a dial-back
connection profile. If the caller’s rates are higher than those charged to the Netopia Router’s return call,
then using CNA has saved the difference.
Default Answer Profile
Calling Number Authentication... Preferred
Must Match a Defined Profile: Yes
PPP Authentication... PAP
Configure values which may be used when receiving a call in this screen.