Communications system

A terminal that communicates using a TFO (tandem-free operation) function, comprising:

• a storage unit relating and storing a dial number of a communications partner, information indicating whether the TFO function has been used in previous communications with a communications partner and a voice-encoding type used in the previous communications;
• and
• a communications unit referring to a storage content of said storage unit and communicating with another terminal with a communication setting that has a high possibility of using the TFO function in communications with the other terminal.

A communications terminal that corresponds to a plurality of voice-encoding types, comprising:

• a storage unit storing information of at least one voice-encoding type out of the plurality of voice-encoding types in relation to identification information of the communications terminal, which is an opposite party;
• and
• a transmitting unit transmitting the information of at least one voice-encoding type stored in relation to the communications terminal, which is an opposite party, to the network in communications.

A communications terminal that designates a voice-encoding type to be used for each communications terminal to communicate and if voice-encoding types to be used by the communications terminals to communicate are the same, performs control so that communications between the terminals can be conducted without using an encoding/decoding function of a transcoder in a network, comprising:

• a storage unit storing information about a voice-encoding type used by a communications terminal itself in communications with another communications terminal, which is an opposite party, are conducted without using the encoding/decoding function of the transcoder, in relation to identification information of the communications terminal, which is the opposite party;
• a transmitting unit transmitting the voice-encoding type information stored in relation to the communications terminal, which is the opposite party, in communications to a network.

A communications terminal that designates a voice-encoding type to be used for each communications terminal to communicate and if voice-encoding types to be used by the communications terminals to communicate are the same, performs control so that communications between the terminals can be conducted without using an encoding/decoding function of a transcoder in a network, comprising:

• a storage unit storing information about a voice-encoding type used by the communications terminal itself when communications with another communications terminal, which is an opposite party, are conducted using the encoding/decoding function of the transcoder, in relation to identification information of the communications terminal, which is the opposite party;
• a transmitting unit transmitting information of another voice-encoding type that is different from the voice-encoding type stored in relation to the communications terminal, which is an opposite party, and to which the communications terminal itself can correspond, in communications to a network.

A communications terminal that designates a voice-encoding type to be used for each communications terminal to communicate and if voice-encoding types to be used by the communications terminals to communicate are the same, performs control so that communications between the terminals can be conducted without using an encoding/decoding function of a transcoder in a network, comprising:

• a storage unit storing both information of the voice-encoding type used by the communications terminal itself in communications with a communication partner and information about whether the communications are conducted without using the encoding/decoding function of the transcoder, in relation to identification information of another communications terminal, which is an opposite party;
• and
• a transmitting unit transmitting information of the voice-encoding type stored in relation to the communications terminal, which is the opposite party, to a network in communications.

A communications terminal that designates a voice-encoding type to be used for each communications terminal to communicate and if voice-encoding types to be used by the communications terminals to communicate are the same, performs control so that communications between the terminals can be conducted without using an encoding/decoding function of a transcoder in a network, comprising:

• a storage unit storing both information of the voice-encoding type used by the communications terminal itself in the latest communications with a communication partner and information about whether the communications are conducted without using the encoding/decoding function of the transcoder, in relation to identification information of another communications terminal, which is an opposite party;
• and
• a transmitting unit transmitting information of a voice-encoding type stored in relation to the communications terminal, which is an opposite party, to a network in communications.

A communications system, comprising:

• a function to designate a voice-encoding type to be used for each communications terminal to communicate and to perform control so that communications between the terminals can be conducted without using an encoding/decoding function of a transcoder in a network if voice-encoding types to be used by the communications terminals to communicate are the same;
• and
• a notification unit notifying at least one of the communications terminals of control information if communications are or have been controlled without using an inter-communications terminal encoding/decoding function.