| 摘要 |
An apparatus and method for preventing misdialing of a telephone number, especially fit for facsimile transmission is provided. The invention operates by dialing precompiled control keys added to the telephone number. The control keys are compared against computed control keys and transmission is allowed or denied according to the match between the dialed and computed control keys. The invention may be implemented in software embedded within the dialing device, in a telephone switch, telephony router, or by a special apparatus inserted anywhere in the transmission path.
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