ISDN trunk group hardware requirements

Last Updated : Sep 26, 2023 |

ISDN-BRI trunk interfaces are supported by all of these:

  • The MM722 BRI media module implements the user side of the BRI trunk interface.

  • The MM720 BRI media module implements both sides of the interface. You can select the options from the BRI Trunk screen.

For BRI trunk connections to a public ISDN, use MM722 or MM720.