IMPROVED SUPERVISION ALGORITHM FOR TELEPHONE INTERCONNECT IN TRUNKED RADIO SYSTEMS
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2002-Mar-14
The algorithm provides an improved method of Answer Supervision and Disconnect Supervision (forced disconnect) on loop start telephone lines for new trunked telephone interconnect systems (such as IntelliRepeater telephone interconnect, or Start Site CIT) over the current method used in today's CIT and MBX systems. Answer supervision is the feature that is used in telephone interconnect sys- tems, such as the CIT and MBX, to determine when a radio to landline call has been connected through and when billing of the call is to begin. Likewise, disconnect supervision is the feature that determines when the landline caller has disconnected (hung up) so that the interconnect channel can be efficiently dropped and to prevent unauthorized reuse of the telephone line. This algorithm could be implemented using digital signal processing algorithms or by analog/digital hardware on new trunking telephone Interconnect products to produce improvement over the existing methods.