Patent ID: 6744864
Filing Date: 2004-06-01
Classification: H04M

Abstract:
A method of controlling a modem to place a telephone call to a telephone line and efficiently classify the telephone line as being connected to one or more of a voice telephone, a fax machine or modem, or a data modem, the method comprising the steps ofA. enabling the modem to, in one call, determine whether the telephone line is connected to a voice telephone, on the one hand, or a fax machine or modem or a data modem, on the other hand, B. during the same call if it is not determined that the telephone line is connected to a voice telephone, or during a subsequent call if it is determined that the telephone line is connected to a voice telephone, determining whether the telephone line is also connected to one of a fax machine or modem, on the one hand, or a data modem, on the other hand by enabling the modem to transmit an appropriate tone thereto and determining whether a connection is completed in response.