Enhanced Circuit-Switched Calls

A terminal for receiving a voice signal, comprising:

• a receiver having a first reception channel arranged to receive at least a first signal over a packet-switched data network and a second reception channel arranged to receive a second signal over a circuit-switched telephony network, the first and second signals each representing information from the voice signal over a same portion of time;
• a speaker for playing the voice signal;
• and
• signal processing apparatus coupled to the receiver and the speaker, configured to reconstruct said voice signal from the first and second signals, and to output the voice signal to the speaker.

A method of transmitting a voice signal, comprising:

• generating a voice signal from a microphone;
• and
• operating a signal processing apparatus to generate a first signal and a second signal from the voice signal, each representing information from the voice signal over a same portion of time;
• transmitting the first signal to a receiver via a packet-switched data network, and transmitting the second signal to said receiver via a circuit-switched telephony network.

A communication application for transmitting a voice signal, the communication application comprising code embodied on a computer-readable medium and configured so as when executed on a processing apparatus of a user device to:

• receive a voice signal from a microphone of the user device;
• and
• generate a first signal and a second signal from the voice signal, each representing information from the voice signal over a same portion of time;
• supply the first signal to a first transmission module of the user device for transmission to a receiver via a packet-switched data network, and supply the second signal to a second transmission module for transmission to said receiver via a circuit-switched telephony network.