import type { Transport } from "../transport";
export type TwilioWsTransportOptions = {
    /** `wss://...` URL of the service's Media Stream endpoint. */
    wsUrl: string;
    /** `customParameters` merged into the Twilio `start` envelope (e.g. sessionId). */
    customParameters?: Record<string, string>;
    /** Caller phone (E.164). */
    from?: string;
    /** Service phone (E.164). */
    to?: string;
    /** Override the simulated streamSid (default: random `MZ…`). */
    streamSid?: string;
    /** Override the simulated callSid (default: random `CA…`). */
    callSid?: string;
};
/**
 * Open a Twilio Media Stream as the caller side. Throws on connect failure.
 */
export declare const twilioWsTransport: (options: TwilioWsTransportOptions) => Transport;
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