code: def modifyPdpContextRequest():
      
      a = TpPd(pd=0x8)
      b = MessageType(mesType=0x48)  # 01001000
      c = RadioPriorityAndSpareHalfOctets()
      d = LlcServiceAccessPointIdentifier()
      e = QualityOfService()
      packet = a / b / c / d / e
      return packet
docs: MODIFY PDP CONTEXT REQUEST Section 9.5.6