def detachRequest(GmmCause_presence=0):
    """DETACH REQUEST Section 9.4.5"""
    a = TpPd(pd=0x3)
    b = MessageType(mesType=0x5)  # 00000101
    c = DetachTypeAndForceToStandby()
    packet = a / b / c
    if GmmCause_presence is 1:
        e = GmmCause(ieiGC=0x25)
        packet = packet / e
    return packet
DETACH REQUEST Section 9.4.5