/**
 * Delegate for {@link Session} offer/answer exchange.
 * @public
 */
export interface SessionDescriptionHandler {
    /**
     * Destructor.
     */
    close(): void;
    /**
     * Gets the local description from the underlying media implementation.
     * @param options - Options object to be used by getDescription.
     * @param modifiers - Array with one time use description modifiers.
     * @returns Promise that resolves with the local description to be used for the session.
     * Rejects with `ClosedSessionDescriptionHandlerError` when this method
     * is called after close or when close occurs before complete.
     */
    getDescription(options?: SessionDescriptionHandlerOptions, modifiers?: Array<SessionDescriptionHandlerModifier>): Promise<BodyAndContentType>;
    /**
     * Returns true if the Session Description Handler can handle the Content-Type described by a SIP message.
     * @param contentType - The content type that is in the SIP Message.
     * @returns True if the content type is  handled by this session description handler. False otherwise.
     */
    hasDescription(contentType: string): boolean;
    /**
     * Rolls back the current local/remote offer to the prior stable state.
     */
    rollbackDescription?(): Promise<void>;
    /**
     * Sets the remote description to the underlying media implementation.
     * @param  sessionDescription - The description provided by a SIP message to be set on the media implementation.
     * @param options - Options object to be used by setDescription.
     * @param modifiers - Array with one time use description modifiers.
     * @returns Promise that resolves once the description is set.
     * Rejects with `ClosedSessionDescriptionHandlerError` when this method
     * is called after close or when close occurs before complete.
     */
    setDescription(sdp: string, options?: SessionDescriptionHandlerOptions, modifiers?: Array<SessionDescriptionHandlerModifier>): Promise<void>;
    /**
     * Send DTMF via RTP (RFC 4733).
     * Returns true if DTMF send is successful, false otherwise.
     * @param tones - A string containing DTMF digits.
     * @param options - Options object to be used by sendDtmf.
     * @returns True if DTMF send is successful, false otherwise.
     */
    sendDtmf(tones: string, options?: unknown): boolean;
}
/**
 * Modifier for {@link SessionDescriptionHandler} offer/answer.
 * @public
 */
export interface SessionDescriptionHandlerModifier {
    (sessionDescription: RTCSessionDescriptionInit): Promise<RTCSessionDescriptionInit>;
}
/**
 * Options for {@link SessionDescriptionHandler} methods.
 * @remarks
 * These options are provided to various UserAgent methods (invite() for example)
 * and passed through on calls to getDescription() and setDescription().
 * @public
 */
export interface SessionDescriptionHandlerOptions {
    constraints?: object;
}
/**
 * Message body content and type.
 * @public
 */
export interface BodyAndContentType {
    /** Message body content. */
    body: string;
    /** Message body content type. */
    contentType: string;
}