/**
 * Allows the agent to play DTMF tones during a phone call.
 *
 * This tool can be used to interact with automated phone systems, such as
 * navigating phone menus, entering extensions, or inputting numeric codes.
 */
export interface PlayDtmfToolConfig {
    /** If true, send DTMF tones out-of-band using RFC 4733 (useful for SIP calls only). If false, send DTMF as in-band audio tones (default, works for all call types). */
    useOutOfBandDtmf?: boolean;
}