1. The technical field to which the invention described in the claims belongs;And more particularly, to a telephone number search method for efficiently searching a port of an extension subscriber by a called subscriber number to be received and easily forming an extension line.;2. Technical challenges to be solved by the invention;The present invention provides a method of searching a telephone number for efficiently forming an extension line by efficiently searching a port of an extension subscriber using a called subscriber number to be received.;3. The point of the solution of the invention;A method of searching a telephone number in a rural / rural switch for efficiently searching a port of an extension subscriber using a called subscriber number to be received and easily forming an extension line, the method comprising the steps of: extracting, from a calling subscriber or a calling subscriber telephone number received from an MMC, The first index searches for a unit number of the station number and the number of the subscriber number, and the second index searches for the unit number of the subscriber unit at the hundred and ten steps. When a minimum four digits number is received from the calling subscriber, And a memory area to which the number of the calling subscriber is assigned is sequentially searched for a search result index, the index is a block number of the port number designation area, the block number is multiplied by one block size, The unit number is added to obtain the offset of the port number designation area.;4. Important Uses of the Invention;Suitable for agricultural and fishery exchanges.
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