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The SpeechLink Protocol is an application-layer control protocol for transferring callers between cooperating speech applications, pre-existing interactive voice response (IVR) applications based on dual-tone multi-frequency (DTMF, or TouchTone) input, and human agents both in call centers and in other locations. The voice path of the call can be carried via the Public Switched Telephone Network (PSTN), a Voice over IP (VoIP) network, or a combination of the two. The control of the call is handled via an IP network, usually the internet. A connection managed via the SpeechLink Protocol is referred to as a "SpeechLink".

This page is maintained by Alan W Black (awb@cs.cmu.edu)
and Kevin A. Lenzo (lenzo@cs.cmu.edu)
Hephaestus is a project within the Sphinx Group at Carnegie Mellon University