Netopia 435 Reference Manual page 47

2-32 Netopia ISDN Router Reference Guide
Set Authentication to PAP or CHAP.
Note: The authentication method you choose determines which
connection profiles are accessible to callers. For example, if you
choose PAP, callers using CHAP or no authentication will be
dropped by the answer profile.
To allow calls that only match a connection profile's remote
IPand/or IPX address:
Toggle Must Match a Defined Profile to Yes, and
set Authentication to None.
To not allow any incoming calls to connect to the Netopia ISDN
Router:
Toggle Must Match a Defined Profile to Yes, and
Set the Dial option in the Telco Options screen of every con-
nection profile to Dial Out Only