export declare class CallbackInstanceResponseMessage {
    'channel'?: CallbackInstanceResponseMessage.ChannelEnum;
    'acknowledged'?: string;
    'undeliverable'?: string;
    'content'?: string;
    static discriminator: string | undefined;
    static attributeTypeMap: Array<{
        name: string;
        baseName: string;
        type: string;
    }>;
    static getAttributeTypeMap(): {
        name: string;
        baseName: string;
        type: string;
    }[];
}
export declare namespace CallbackInstanceResponseMessage {
    enum ChannelEnum {
        Sms,
        Email,
        Voice,
        NA
    }
}