TwiML verbs and what an IVR is

• Wikipedia says an IVR interacts with callers, gathers information, and routes calls, using speech recognition and DTMF from the keypad.
• The article says IVR is often combined with an automated attendant and an automatic call distributor.
• Twilio's TwiML page lists voice nouns and verbs including Say, Play, Gather, Dial, Conference, Queue, Record, Redirect, Hangup, Pause, Pay, Refer, Reject, and Sip.
• The voice navigation also names Build IVR phone trees and a VirtualAgent noun.
• RFC 4733 is still the RTP payload for the keypad digits. Gather is Twilio's verb. They are not the same document.

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