Closed User Group

The Closed User Group (CUG) allows the configuration of one or more virtual private networks within a larger public network. The CUG allows a user to collect a number of DTEs into a single logical group, and it restricts access to the group's ability to receive incoming calls from or make outgoing calls to the restricted open portion of the network. The number of CUGs is network-dependent. A single DTE can belong to one or more CUGs.

Within the CUG category, you can specify the following access for a user connection:

• Incoming access (CUG with Incoming Access), in which a DTE can communicate with other DTEs within the CUG and receive incoming calls from outside the CUG
• Outgoing access (CUG with Outgoing Access), in which a DTE can initiate calls to other DTEs outside the CUG
• Both incoming and outgoing access

If a DTE belongs to more than one CUG, you must also specify a preferred (or primary) CUG.