export interface WHIPResult {
    answerSDP: string;
    sessionURL: string;
    /** ETag identifying the ICE session (RFC 9725 §4.3.1); needed to PATCH it. */
    etag: string;
    /**
     * Single-use credential for reattaching a later redial to this
     * conversation. Empty when the server cannot resume — a realtime
     * (speech-to-speech) session, whose history lives inside the provider.
     */
    resumeToken: string;
    /**
     * "new", "resumed", or "expired". Anything but "resumed" on a redial means
     * the agent has no memory of the earlier conversation.
     */
    resumeStatus: string;
}
/**
 * Opens a WHIP session (RFC 9725 §4.2).
 *
 * `resumeToken` is a StreamCore extension: it asks the server to reattach this
 * new transport to the conversation a previous connection was having, rather
 * than starting a fresh one. Check `resumeStatus` on the result — a token the
 * server no longer recognises still yields a working call, but one whose agent
 * remembers nothing.
 */
export declare function whipOffer(whipUrl: string, offerSDP: string, token?: string, resumeToken?: string): Promise<WHIPResult>;
export interface WHIPRestartResult {
    /** The server's reply fragment, to fold into the stored remote description. */
    fragment: string;
    /** The rotated ETag identifying the new ICE session. */
    etag: string;
}
/**
 * Thrown when a PATCH is rejected. `status` lets the caller tell a retryable
 * failure from a terminal one — a 404 or 409 means the session is gone and no
 * amount of retrying will bring it back.
 */
export declare class WHIPRestartError extends Error {
    readonly status: number;
    /** ETag the server reported as current, present on a 412. */
    readonly currentEtag: string;
    constructor(status: number, message: string, currentEtag?: string);
    /** Whether another attempt against the same session could still succeed. */
    get retryable(): boolean;
}
/**
 * Sends an ICE restart to the session URL per RFC 9725 §4.4.2.
 *
 * `etag` is sent as `If-Match` so a restart racing another one is rejected
 * rather than applied to a generation that no longer exists.
 */
export declare function whipRestartIce(sessionURL: string, fragment: string, etag?: string, token?: string): Promise<WHIPRestartResult>;
export declare function whipDelete(sessionURL: string, token?: string): Promise<void>;
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