Prevent merging conference calls hosted on peer device.

     * - {@link com.android.internal.telephony.Phone#TTY_MODE_VCO}

     */

    void callSessionTtyModeReceived(in IImsCallSession session, in int mode);

    /**

     * Notifies of a change to the multiparty state for this {@code ImsCallSession}.

     *

     * @param session The call session.

     * @param isMultiParty {@code true} if the session became multiparty, {@code false} otherwise.

     */

    void callSessionMultipartyStateChanged(in IImsCallSession session, in boolean isMultiParty);

}