Equipment identity register (EIR)
The equipment identity register is often integrated to the HLR. The EIR keeps a list of mobile phones (identified by their IMEI) which are to be banned from the network or monitored. This is designed to allow tracking of stolen mobile phones. In theory all data about all stolen mobile phones should be distributed to all EIRs in the world through a Central EIR. It is clear, however, that there are some countries where this is not in operation. The EIR data does not have to change in real time, which means that this function can be less distributed than the function of the HLR. The EIR is a database that contains information about the identity of the mobile equipment that prevents calls from stolen, unauthorized or defective mobile stations. Some EIR also have the capability to log Handset attempts and store it in a log file.
[edit] Other support functions
Connected more or less directly to the GSM core network are many other functions.
[edit] Billing centre (BC)
The billing centre is responsible for processing the toll tickets generated by the VLRs and HLRs and generating a bill for each subscriber. It is also responsible for to generate billing data of roaming subscriber.
[edit] Short message service centre (SMSC)
The short message service centre supports the sending and reception of text messages.
[edit] Multimedia messaging service centre (MMSC)
The multimedia messaging service centre supports the sending of multimedia messages (e.g., images, audio, video and their combinations) to (or from) MMS-enabled Handsets.
[edit] Voicemail system (VMS)
The voicemail system records and stores voicemails
The equipment identity register is often integrated to the HLR. The EIR keeps a list of mobile phones (identified by their IMEI) which are to be banned from the network or monitored. This is designed to allow tracking of stolen mobile phones. In theory all data about all stolen mobile phones should be distributed to all EIRs in the world through a Central EIR. It is clear, however, that there are some countries where this is not in operation. The EIR data does not have to change in real time, which means that this function can be less distributed than the function of the HLR. The EIR is a database that contains information about the identity of the mobile equipment that prevents calls from stolen, unauthorized or defective mobile stations. Some EIR also have the capability to log Handset attempts and store it in a log file.
[edit] Other support functions
Connected more or less directly to the GSM core network are many other functions.
[edit] Billing centre (BC)
The billing centre is responsible for processing the toll tickets generated by the VLRs and HLRs and generating a bill for each subscriber. It is also responsible for to generate billing data of roaming subscriber.
[edit] Short message service centre (SMSC)
The short message service centre supports the sending and reception of text messages.
[edit] Multimedia messaging service centre (MMSC)
The multimedia messaging service centre supports the sending of multimedia messages (e.g., images, audio, video and their combinations) to (or from) MMS-enabled Handsets.
[edit] Voicemail system (VMS)
The voicemail system records and stores voicemails
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