You can administer any telephone as a TEG member. However, only a multiappearance telephone can be assigned a TEG button with a merged-status lamp. With the TEG button, the user can select a TEG call appearance to answer or bridge onto an existing call, but not to originate the call. The TEG members are assigned on an extension number basis. Call reception restrictions applicable to the group are specified by the class of restriction (COR) for the group. The group COR takes precedence over an individual member’s COR. When a Terminating Extension Group (TEG) receives an incoming call, the TEG's primary Class of Restrictions (COR) is considered for the calling and called restrictions. The members could all be termination-restricted but still receive calls if the group is unrestricted.

When a TEG members answers an incoming call, a temporary bridged appearance is maintained at the multiappearance telephones in the group. However, this appearance is not visible. Any TEG member can press the TEG button to bridge onto the call.