code: def pagingRequestType1(MobileId_presence=0):
      
   #The L2 pseudo length of this message is the sum of lengths of all
   #information elements present in the message except
   #the P1 Rest Octets and L2 Pseudo Length information elements.
      a = L2PseudoLength()
      b = TpPd(pd=0x6)
      c = MessageType(mesType=0x21)  # 00100001
      d = PageModeAndChannelNeeded()
      f = MobileId()
      packet = a / b / c / d / f
      if MobileId_presence is 1:
          g = MobileIdHdr(ieiMI=0x17, eightBitMI=0x0)
          packet = packet / g
      h = P1RestOctets()
      packet = packet / h
      return packet
docs: PAGING REQUEST TYPE 1 Section 9.1.22