private static String decodeCPT(final short id)
    {
        switch (id)
        {
            case (short)0x0000: return "UCMM";
            case (short)0x00A1: return "connection based";
            case (short)0x8000: return "sockaddr, orig->tgt.";
            case (short)0x8001: return "sockaddr, tgt.->orig";
            case (short)0x8002: return "sequenced address";
            case (short)0x00B1: return "Connected PDU";
            case (short)0x00B2: return "Unconnected Message";
        }
        return "<unknown>";
    }