| 摘要 |
Apparatus and process for searching for an area code from an exchange/area code directory and inserting an area code into a dialed telephone number. The inserted area code is based on the three digit exchange prefix of the dialed telephone number. An area code insertion module includes at least one entry comprising an association between an exchange number and an area code. A controller compares the digits corresponding to the exchange of a seven digit dialed telephone number with entries in the exchange/area code directory. The controller adds the resultant area code obtained from the exchange/area code directory together with any other special dialing digits required to dial such a telephone number before the digits of the dialed telephone number. A DTMF generator causes the completed telephone number to be presented to the telephone line and central office. The area code insertion module and/or the exchange/area code directory may be maintained at the customer premises equipment or at the central office. The entries in the exchange/area code directory may be pre-stored by the user or downloaded over the public switched telephone network, e.g., from a central office.
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