Patent ID: 7616626

Claim:
A telephone exchange apparatus for accommodating a plurality of extensions adapted to connect telephone terminals to each terminal end and connecting at least one line wire, the telephone exchange apparatus executing communication service functions relating to at least one of switches between mutual extensions, between an extension and a line wire, and between mutual line wires, comprising: a memory which stores data showing a corresponding relation between a plurality of mutually different communication service functions defined hierarchically and a plurality of resources for executing the communication service functions, wherein the communication service functions include a plurality of first-level communication service functions and a plurality of second-level communication service functions, the plurality of first-level communication service functions being included in the plurality of second-level communication service functions, and the plurality of second-level communication service functions being included in all the communication service functions; a recorder which records communication signals for processing in the each resource, on a recording medium; a processor which processes the communication signals on the recording medium based on the corresponding resource stored in the memory; and a controller which controls to manage the communication signals on the recording medium by each resource, releases a corresponding resource area on the recording medium according to the first-level communication service function requesting to release, without releasing resource areas corresponding to other levels of communication service functions, releases corresponding resource areas on the recording medium corresponding to the second-level communication service functions, and releases the corresponding resource areas on the recording medium corresponding to all the communication service functions according to a predetermined condition, based on the data stored in the memory.