# Voice Funnel

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1980s network interface for digitized speech

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The **Voice Funnel** was an experimental high-speed interface between digitized speech streams and a [packet switching](/source/Packet_switching) communications network, in particular the [ARPANET](/source/ARPANET). It was built in the time frame from 1979 to 1981. It may be viewed as an early [Voice over IP](/source/Voice_over_IP) voice and video telephone.

The Voice Funnel was designed and built by [Bolt, Beranek and Newman](/source/Bolt%2C_Beranek_and_Newman). During the 1980s, it was used for audio and video conferences across the [ARPANET](/source/ARPANET), and later evolved into the multi-processor [BBN Butterfly](/source/BBN_Butterfly) computer.

## See also

- [Network Voice Protocol](/source/Network_Voice_Protocol)

## References

- Rettberg, R., C. Wyman, D. Hunt, M. Hoffman, P. Carvey, B. Hyde, W. Clark and M. Kraley. *Development of a Voice Funnel System: Design Report*, [Bolt, Beranek and Newman](/source/Bolt%2C_Beranek_and_Newman), Report No. 4098, August 1979.

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