/**
 * @module botbuilder
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
/**
 * Constants used to populate the Activity.callerId property.
 */
export declare class CallerIdConstants {
    /**
     * The caller ID for any Bot Framework channel.
     */
    static readonly PublicAzureChannel: string;
    /**
     * The caller ID for any Bot Framework US Government cloud channel.
     */
    static readonly USGovChannel: string;
    /**
     * The caller ID prefix when a bot initiates a request to another bot.
     *
     * @remarks
     * This prefix will be followed by the Azure Active Directory App ID of the bot that initiated the call.
     */
    static readonly BotToBotPrefix: string;
}
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