Mobile switching center with outgoing access closed user group interlock code

摘要

A mobile switching center of an apparatus in one example is configured to provide a closed user group (CUG) supplementary service to a mobile communication device. The mobile communication device is a member of a default CUG and is not provisioned for outgoing access. The mobile switching center is configured to provide a plurality of CUG interlock codes that correspond to a plurality of closed user groups (CUGs). The plurality of CUG interlock codes comprise at least one outgoing access (OA) CUG interlock code. The mobile switching center is configured to provide a default behavior according to the default CUG for an outgoing call from the mobile communication device. The mobile switching center is configured to provide outgoing access to the mobile communication device for the outgoing call if a setup message from the mobile communication device for the outgoing call comprises a request for the OA CUG interlock code.