ISDN trunk group hardware requirements

Last Updated : Oct 07, 2026 |
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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.
Related links
ISDN trunk groups Administration