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The Bilateral Closed User Group (BCUG) offers a finer degree of access control than the CUG offers. Bilateral signifies a CUG relationship that has been limited to a pair of DTEs. Access between the pair of DTEs is unrestricted. However, access to or from any other DTE is not possible. A DTE can belong to one or more bilateral CUGs, but cannot call DTEs that do not belong to a BCUG.
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