Unstructured Supplementary Service Data (USSD) is a protocol used by GSM cellphones to communicate with their service provider’s computers. USSD can be . Unstructured Supplementary Service Data (USSD), sometimes referred to as ” Quick Codes” or USSD can be used to provide independent calling services such as a callback service (to . GSM (ETSI EN , V) Specification (USSD) Stage 3 – 3GPP; USSD Technology and packet flow in GSM network. USSD Call FLowThere are two types of USSD — 1. Network Initiated – Push Mode 2. User Initiated – Pull Mod.

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The session remains open over a radio connection until the USSD service is completed, the user terminates the application, an incorrect option is entered from the menu, or a time-out happens.

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Using the latest USSD technology, the operator can float new services and various applications at much cheaper rates while enhancing operational efficiency and generating incremental revenues by delivering flwo value to the prepaid customer base. If the caller qualifies, the application initiates a mobile terminating call to the calling party first.

In practice, only USSD specific modifications are needed for external applications. Retrieved 9 May USSD is proving to be the ideal medium for quickly deploying a variety of new services and applications. When patients regularly skip taking their medicine, or take it at the wrong time, the severity of their disease can increase, often necessitating costlier and more expensive second-line treatment. USSD data coding scheme: USSD can be used for WAP browsing, prepaid callback service, mobile money services, location-based content services, menu-based information services, or even as part of configuring the phone on the network.


They are interpreted by the handset first before a corresponding command not the code itself is sent to the network.

After the required precall checks, the prepaid roaming platform initiates two outgoing calls i. Critical Review Of Security Options For Mobile Banking Mobile banking brings new opportunities and new horizons, but also comes with implicit risks to financial providers, carriers, and the financial system.

This is clearly valued by the users. As no credit checks are requiredsigning a prepaid service is a simple and hassle-free floe for new subscribers. Operators can also ussr the unused character space in the balance inquiry response to deliver targeted marketing messages to prepaid customers in order to cross- and up-sell additional services.

You are commenting using your WordPress. If even HLR is unable to decode it, an error message gets passed downward and the fow is terminated.

Unstructured Supplementary Service Data – Wikipedia

You are commenting using your WordPress. Retrieved from ” jssd For prepaid subscribers, an additional verification needs to be done to ensure that an floww credit balance is available before allowing them to use the services. The processing happens in the same way as explained above, but the supporting USSD application server may be different. The MS processes the operation if it is in a state in which it can handle the operation.

The coding of this parameter is according to the cell broadcast data coding scheme as specified in 3GPP TS Subscriber does not have to create a message. Figure 5 shows the flow diagram for a mobile-initiated USSD request.


My Telecom Space: USSD Call FLow

To profitably grow in this segment, service providers need to embrace a business model that focuses on maximizing the use of existing network assets while reducing operational expenses via streamlined, cost-efficient processes. USSD is increasingly being adopted to develop interactive applications like mobile chatting, roaming with prepaid service, callback service, simultaneous software up-gradation of huge customer base, prepaid recharge, mobile banking, etc.

On answer from called party C, a circuit-switched call is established between the roamer and the called party. This error is returned if the receiver is not able to deal with the contents of the USSD string. If there are any latest updates applicable for that model from the mobile company, the updates are performed via OTA.

In the core network, the message was delivered over MAP. After the required precall checksthe prepaid roaming platform initiates dlow outgoing calls i.

USSD codes, also known as short codes, are simple to use. After receiving the model details at the operator end, the software version, features, IMEI manufacturer for that model, etc.

Groups of digits may be separated by additional asterisks. This site uses cookies. Prepaid recharge even while roaming through registered credit card 8.