
114062 Rev. B 13-1
Chapter 13
Customizing Caller Resolution
For security purposes, all three dial services use a PPP identification mechanism
to determine who is calling the router. PPP performs this identification process
using one of two authentication protocols, CHAP or PAP.
CHAP is the default authentication protocol. To configure PAP, you must edit the
PPP interface configuration and modify the Local Authentication Protocol
parameter before setting up the caller resolution table. Refer to Configuring PPP
Services for instructions.
To identify remote callers, you enter the caller name and CHAP secret or PAP
password of each remote caller in the caller resolution table, and assign a local
demand, primary, or bandwidth circuit to each caller.
The authentication process starts during link negotiation. The remote caller
includes its CHAP name or PAP ID in the CHAP challenge or PAP authenticate
request to the called router. When the called router receives the call, it checks its
caller resolution table for a matching entry. If the remote caller is authorized, the
called router activates the assigned circuit.
For more information about authentication, refer to Chapter 4.
Caller Resolution for Demand Circuit Groups
The router also uses the caller resolution table for demand circuit groups. Demand
circuit groups can only receive calls. For a demand circuit group to accept an
incoming call, you configure the table and assign the demand circuit group to a
remote caller. After the router authorizes a remote caller, it activates a circuit from
the assigned demand circuit group.
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