Abstract: A modem parameter required for a modem apparatus is stored in a memory for each telephone number of a communication destination in advance based on past communications. At a communication time, a receiver side is notified of an execution of the short protocol by a QTSD signal, and sequentially a QINFO signal that includes the modem parameter is transmitted. Since the modem parameter is received by the communication destination, the pre-protocols such as exchange of parameter, etc., are shortened so that communication time can be shortened. Moreover, since the transmission of modem parameter is repeated until it is confirmed that the communication destination receives the modem parameter, occurrence of communication errors can be avoided so that the shortened pre-protocols can be surely executed.

Abstract: A data-communication apparatus for performing data communication by using a modem with a plurality of modulation/demodulation modes, operated in a mode specified from among the plurality of modulation/demodulation modes, is capable of distinguishing signals in a plurality of modulation/demodulation modes which may be simultaneously received by the data-communication apparatus. Specifically, a frequency-detection function provided in a modem is used to detect the frequency of the V.8 protocol signal CI while the modem is receiving the signal in the V.21 mode in the T.30 protocol. When the frequency is detected, a CPU causes the mode of the modem to switch to the V.8 mode for signal reception.

Abstract: A novel and improved method and apparatus for providing an interface to a digital wireless telephone system compatible with standard analog wire line telephones and analog wire line fax machines is disclosed. During a telephone call, a fax detector monitors the incoming data for fax signals. If a fax is detected, the data processor switches from processing the data as if it were voice to processing it as fax In addition, the remote station is sent a signal notifying it to process the data as fax rather than voice. The fax detector operates by detecting the preamble of a V.21 message, present at the beginning of every fax call. Energy is measured in both frequencies of the BFSK signals. A decision is made by analyzing these energies and locating a specific pattern which repeats itself a sufficient number of times.

Abstract: A facsimile gateway provides fax transmission over a packetized network. To accommodate packet delay in the network, an alternate protocol source provides the appropriate notifications to the originating fax machine. In one embodiment, the gateway is constructed using conventional class II or 2.0 fax/modems and voice processing boards. The fax board provides most of the fax gateway operations. As needed, the voice board is switched into the call to provide notifications to prevent a time-out in the originating fax machine.

Abstract: A method and arrangement for transmitting audio signals from one communication terminal equipment (KES) via a communication network to another communication terminal equipment (KEE) using the facsimile transmission protocol of ITU-T.T4 and ITU-T.T.30, has the following method steps: a digital input audio signal is compressed in the sending communication terminal equipment (KES); the compressed audio signal is divided into data frames according to ITU-T.T.4 Annex A and ITU-T.T.30 Annex A; every data frame is identified as an audio information data frame (ACD, SCD); the audio information data frames (ACD, SCD) are transmitted from the sending communication terminal equipment (KES) to the receiving communication terminal equipment (KEE) using the facsimile transmission protocol and are stored in the latter; and the stored audio information data frames are output as digital audio signal after application of a decompression method or are further-processed.

Abstract: A method and an apparatus for implementing the method, which allow a transmitter (100) of a digital telecommunication system transmitting speech to transmit predetermined messages to a receiver (102) over a speech channel (108). Messages (114) are transmitted from the transmitter (100) to the receiver (102) on the speech channel (108) in such a way that they are encoded in some of the speech coding bits, whereby the speech coding bits selected for message transmission have been selected in such a way that they affect the quality of speech as little as possible. Most preferably, the speech coding bits used for transmitting messages are protected by channel coding (702, 704). Speech coding bits are “stolen” for message transmission only for very short periods at a time and only for exactly the time it takes to transmit the messages (114); at other times, the entire speech channel (108) is used normally for speech transmission.