Cisco Tcl and VoiceXML applications on the Cisco gateway provide Interactive Voice Response (IVR) features and call control functionality such as call forwarding, conference calling, and voice mail.

IVR systems provide information through the telephone in response to user input in the form of spoken words or dual tone multi frequency (DTMF) signaling. The Cisco voice gateway allows an IVR application to be used during call processing. A Cisco voice gateway can have several IVR applications to accommodate many different services, and you can customize the IVR applications to present different interfaces to various callers.