Voice over the internet method and system

A voice data transmission system, comprising:

• a voice over internet gateway for receiving a signal from a radio device and for converting the signal to a format for transmission over a network to an end destination;
• wherein the voice over internet gateway has a processor for receiving an off-hook signal from a DTMF telephone or an on-hook signal from a DTMF telephone to initiate or terminate a session initiation protocol so that the gateway establishes a session initiation protocol transmission over the network, or terminates a session initiation protocol transmission over the network;
• and
• wherein the processor being for also receiving a signal from a radio device which is not able to produce an off-hook or on-hook signal, the signal comprising a tone signal containing control data for identifying the signal as a signal to initiate or terminate a session initiation protocol so that upon receipt of the signal, the gateway establishes a session initiation protocol transmission over the network or terminates a session initiation protocol transmission over the network.

A voice data transmission method, comprising:

• receiving a signal from a radio device and for converting the signal to a format for transmission over a network to an end destination;
• receiving an off-hook signal from a DTMF telephone or an on-hook signal from a DTMF telephone to initiate or terminate a session initiation protocol so that the gateway establishes a session initiation protocol transmission over the network, or terminates a session initiation protocol transmission over the network;
• and
• receiving a signal from a radio device which is not able to produce an off-hook or on-hook signal, the signal comprising a tone signal containing control data for identifying the signal as a signal to initiate or terminate a session initiation protocol to establish a session initiation protocol transmission over the network or terminates a session initiation protocol transmission over the network.