import { IncomingInfoRequest } from "../core";
import { Info } from "./info";
/**
 * A DTMF signal (incoming INFO).
 * @deprecated Use `Info`.
 * @internal
 */
export declare class DTMF extends Info {
    private _tone;
    private _duration;
    /** @internal */
    constructor(incomingInfoRequest: IncomingInfoRequest, tone: string, duration: number);
    readonly tone: string;
    readonly duration: number;
}
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