View Full Term. By clicking sign up, you agree to receive emails from Techopedia and agree to our Terms of Use and Privacy Policy. This number has two parts. The initial part is comprised of six digits in the North American standard and five digits in the European standard. It identifies the GSM network operator in a specific country with whom the subscriber holds an account.
The second part is allocated by the network operator to uniquely identify the subscriber. When a mobile is affiliated, a temporary IMSI is allocated and used to identify the subscriber in future exchanges. This is embedded in the SIM of the mobile equipment and is provided anytime the network is accessed. It is transmitted during initialization.
To prevent the subscriber from being identified and tracked by eavesdroppers on a radio interface, the IMSI is rarely transmitted. A randomly generated temporary mobile subscriber identity TMSI is sent instead of the IMSI, to ensure that the identity of the mobile subscriber remains confidential and eliminate the need to transfer it in an undeciphered fashion over radio links. The number is directly provisioned in the phone or in the R-UIM card. The three components within IMSI are mobile country code, mobile network code and mobile subscriber identification number.
IMSI International Mobile Subscriber identity is the information that is used for identification of a mobile phone end-user on a network and is uniquely associated with a given cell phone The IMSI code is stored as a 64 bit number or field, and is sent by the mobile phone to the cellular network. The code can also be used by the mobile network to obtain additional information about the phone from the HLR home location register or from the visitor location register.
In order to help minimize the code from being captured by eavesdroppers, the IMSI code is transmitted as little as possible. An IMSI code is used by any cellular network that allows connections with other mobile networks today most do. As stated, IMSI codes are typically 15 digits in length, but can be shorter.
The first three numbers in the code represent the MCC mobile country code. The field of IMSI analysis is designed to help identify the mobile network that an mobile phone belongs to and whether or not it is allowed to use other cellular networks using the IMSI code. Some networks require subscribers to subscribe to roaming capability which may or may not result in increased charges for the mobile subscriber.
This information is primarily used to determine if the phone is able to use international roaming. More recently; however, the GSM numbering authority has gone on the record to state that only a single conversion is made to complete this process.
In North America, once the conversion occurs, the phone can be directly routed on SS7-based networks. SCCP Signaling Connection Control Part is a protocol designed to operate at the network layer providing extended segmentation, flow control, routing error correction, and connection-orientated capabilities in telecommunication networks.
When used on mobile networks, SCCP message point codes are used to ascertain a node on the respective network. The subsystem number will be used to locate or address specific applications available on the node and will use Global Title Translation to determine the Point Code from the Global Title. This information will inform MTP on the appropriate location to send or route messages.
Every SCCP message will include various parameters that provide information on the type of addressing system being used and how the respective message should be routed. Information included in the Address indicator section of the message includes:. A SCCP message will also include a Global Title field if used which will include the address indicator coding, and if the code is a national one or not.
Class 0 : Basic protocol that is connectionless. The full form says that this identity is unique across the globe. To maintain uniqueness, it follows a hierarchical structure. In this tutorial, we are explaining the IMSI format and other details.
The length of the IMSI number is 15 digits. The globe has multiple countries, and each has a mobile country code or MCC. Each country gets the MCC from a standard telecommunication body. It is of a fixed length of three digits,. Within a country, there can be multiple mobile operators at various locations. Each operator has multiple mobile network codes or MNCs within the country. Within a nation, according to the area.
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