SUBSCRIBER CALL-IN-PROGRESS INDICATION
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-10
In an advanced trunking system, when a busy override call is started, some sites and radios may not be included initially in the call due to lack of channel resources at the affected sites. These radios are not aware that a call is proceeding without their participation. This condition can last for a long period of time. During that time, the radio users may attempt to make calls on the talk-group that has current call activity, but they will not success- fully achieve a call grant. The affected radio users will not be aware of the call activity on their current talkgroup.