The SingISDN Access Server

The SingISDN on the ZIP network is a Cisco 4500 access server. This access server is set up to handle ISDN dialup clients for IP and can be used as a template for any similar access server on the ZIP network. Each access server needs to have unique network layer addresses because it is impossible to have duplicate network layer addresses on an internetwork. The configuration of this access server features the following:

  • ISDN dialup configuration for IP clients

  • A local username database for user authentication

  • An ISDN rotary group using four ISDN BRI interfaces

  • A dialer interface that authenticates PPP sessions using PAP, CHAP, and MS-CHAP

  • An access list that permits only specific IP traffic to maintain a current ISDN call ...

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