2.3 Modem Configuration
2.3.5 Automatic configuration of modems

Modem autoconfiguration is another method (the preferred method) for configuring modems. Modem autoconfiguration facilitates the configuration of modems on access servers. To set up a modem using modem autoconfiguration, connect the phone line and power cable to the modem, and use the router's modem autoconfigure command on the line attached to the modem. Most modems require no other setup function.

To provide a better understanding of modem autoconfiguration, this section contains the following topics:

  • Modem capability database (modemcap file in the Cisco IOS® software) -- Modemcap is a database of modems and their modem configuration command strings.

  • Modem autodiscovery --You can configure a line to automatically attempt to discover the type of modem on the line and to use that modem configuration.

  • Modem autoconfiguration --You can configure a line to use a specified modem type.