| 摘要 |
<p>[Problem] When the operating state of a contract line representing an external line is changed without notification in a case in which a telephone communication system is built using extension telephones, the operating state of the corresponding extension telephone also undergoes a change. In the prior art, a problem was presented in that such a change in the operating state of an extension telephone was difficult to appropriately track and manage. [Solution] In order to resolve the above problem, the present invention provides an extension telephone management system in which: an ID is assigned to an external line, and whether the external line is operational or is out of operation is managed in association with the ID, whereby the identity of the external line is recognized even when there is a change in the operating state, and such a transition in various types of information about a line that accompanies a change in a line number such as the one described above is readily tracked and managed; and information about the correspondence between the extensions and the external lines is also stored, the information indicating which of the external numbers can be used by the telephone apparatus that has been assigned an extension number, whereby the operating state of the extension line that accompanies the change in the operating state of the external line can also be appropriately tracked and managed.</p> |
