Copyright © 2018 Authors. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. International Journal of Engineering & Technology, 7 (4.36) (2018) 1357-1360 International Journal of Engineering & Technology Website: www.sciencepubco.com/index.php/IJET Research paper Implementation of missed call for making a password and controlling devices Ferry Wahyu Wibowo 1 * 1 Informatics Department, Universitas Amikom Yogyakarta *Corresponding author E-mail: ferry.w@amikom.ac.id Abstract The cellular phones do not use telephone cables. The cellular phones send radio signals into the air to the nearest transmitter tower called the base station. The transmitter tower will emit the signal to the next station and so on until it reaches the phone that is called. When a new call arrives on the phone number, it will generate a tone until it is picked up, rejected, or the time has been ended to receive this tone (each telephone network provider has different policies related to the time used for this telephone connection so that this causes the num- ber of rings raised to vary). This paper focuses on the missed call services which is one of the features found on the telephone. The tone that has been generated by this calling can emerge ring. This ring can be detected and manipulated to be something useful for controlling devices or making some password. Keywords: Control, Missed call, Password, Ring, Telephone. 1. Introduction The communication data is a field that has an intersection between the field of communication and information technology. The com- prising of the information technology has a wide contribution to the human life while the communication in the worldwide has a portion to share the information and make a network. The tech- nology has a rapid innovation with the development of the devic- es, products, and theories. This also has an impact on the other sectors. The industrial revolution has also grown more over to balance with the rising of the knowledge [1]. Many applications could be categorized into some definitions. The categories of the human-machine interaction (HCI) has 3 definitions which are the interaction between person and person, the interaction between person and machine, and the interaction between machine and machine. This paper addressed the control system which is emphasizing on utilizing of the cellular phone services i.e. missed call service. A missed calling is one of the features of the telephone that for some people perhaps it could annoy but for others, it could be utilized, it depends on the condition and usage. The missed call is an activity to call a number of the mobile phone/cellular phone and hang up before that mobile phone number can pick up the call. It could be meaning if there is a commitment before such as requesting to call back, picking up now, etc. [2]. The missed call is an intentional use by older mobile phone users and it also could be known with another term as deliberately missed call (DMC) [3]. The missed call is no charge communication, but it could be charged by the provider if the user intends to miss call to such number of mobile phones but it gets the answer by the provider. At the beginning of the emerging, this feature of the mobile phone in some countries has been widely used and spread. The mechanism of the mobile phones works can be written as following when the sender dials the mobile phone numbers and thus press the call key. The mobile phone will select the available radio channels and sends a radio signal containing a mobile phone/telephone numbers that will be called to the nearest base station. So then the base station will send a signal to the nearest base station network until it finds the phone that is called. The phone that is called sends a message back through the base station, which states whether the phone is availa- ble or not. At that time, it can be heard the dial tone. This will continue until the telephone is picked up or disconnected by the recipient. The dial tone sound has a number that varies from one provider to another provider. The amount of information that can be sent by the modem is limited by its speed in processing infor- mation. The data compression can speed up the process by cutting up information that is not important. The amount of information that can be processed every second by a telephone is called the bandwidth. 2. AT Commands One of the control commands of the cellular phone modula- tor/demodulator (modem) is known as an AT command. The AT itself is an abbreviation of Attention [4]. Every command to con- trol the modem starts with “AT” so that’s why it is called AT commands e.g. ATA (used to answer), ATD (used to dial), ATH (used to hook control), and ATO (used to return to online data). So the command of “AT” is the prefix that instructs the modem to do something or specific tasks. These command sets are supported by the general packet radio service (GPRS) / global system for mo- bile communication (GSM), besides for the modems, the mobile phones are also supporting these command sets with the specific to the technology of GSM e.g. AT+CMGL (used to list short mes- sage service (SMS)), AT+CMGR (used to read an SMS messages), AT+CMGS (used to send SMS message), and AT+CMSS (used to send SMS message from the storage). From this definition, it could be withdrawn a conclusion of the categories which are basic commands and extended commands. The first example mentioned is categorized as basic commands while the second example is