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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However, implementing prepaid roaming with USSD is rather simple, fast, cheaper, and supported by almost all existing networks, providing a global footprint.

Starts with basic stuff and then go in to architecture and how it works. USSD technology is the key solution in all cases. USSD can therefore be expensive in terms of its resources assigned. The menu implementation of USSD can be set in a single transaction, and the interested users can dig into the required information.

Depending on the sophistication of the rating platform, the subscriber will be billed according to one of the following criteria: Additional guidance should be sought wherever necessary before taking any action. Clearly, the positives of USSD far outweigh the negatives. By continuing susd use this website, you agree to their use.

The MS processes the operation if it is in a state in which it can handle the operation. USSD uses the callback principle to enable prepaid roaming. USSD has several advantages as cwll bearer technology, such as: The analysis given should not to be considered an exhaustive or fully objective list. However, the churn rate is very high, and gaining the loyalty of prepaid subscribers poses a great challenge for mobile operators.

USSD Call Back | Rauf’s Knowledge Portal

Currently, most usad the prepaid roaming implementations utilize the capabilities provided by:. The third party then passes the message to the bank across an encrypted fixed line to the bank, where it is typically stored in a secured environment. The prepaid mobile market is evolving all over the world, with prepaid making up a significant and growing number of subscribers. For many operators, prepaid now represents up to 80 percent or more of their subscriber base. It is a messaging service that is almost seven times faster than SMS and is highly cost effective.


To get this information, the network operator can use USSD. For that you can use USSD call Back service, but the user needs to initiate the service by using a special service code. Figure 1 shows the USSD network architecture.

The MS can also terminate a dialogue by sending a release complete message. The USSD application responds by sending an updated balance and ends the session. From the core network to the internet, the reach of modern USSD services is rapidly transforming the telecom cloud into a services cloud.

Also, users accustomed to accessing a particular service in their home network are able to access that network from another country. As you have seen in the previous section your ussd application is responsible for the content displayed.

Generally, billing is based on the duration of the session. On disconnection from any Of the parties, it releases the call and frees up resources. The string is sent either by the mobile user or the network.

It can be concluded from this discussion that the USSD technology can go a long way in improving the living conditions of the poor.

USSD provides session-based messaging between mobile terminals and mobile services and can also be used to enable many other value-added services such as WAP, interactive chat, prepaid balance checks, and voucher top-up. Once the call is established between roamer and intended called party, the HPLMN monitors the service usage against the available balance in real time.

Pull-based services like informational services News, weather, movies, sports update Currency update, stock market Telephone directory, Yellow Pages 2. An example of such an application could be as follows: In cases where the credit balance is exhausted during the call, an appropriate notification is sent to the roamer before call disconnection.


Prepaid Roaming Using USSD Callback (Roaming Implementation for Prepaid) Part 1

As compared to a once-off transaction allowed in Phase 1. New service New technology Different business flo tariff and other plans Using the latest USSD technology, the operator can float new services and various applications at much cheaper rates floa enhancing operational efficiency and generating incremental revenues by delivering practical value to the prepaid customer base. The coverage of cell phone networks in relation to fixed ATMs and branches helps reach more customers.

By using this site, you agree to the Terms of Use and Privacy Policy. This indicates that the receiving entities cannot process the request because of barring of the initiated service. Aroamer in a visited network requests a call to be set up by keying a special service or access code and the MSISDN number of the destination party. This operation could be a request to get certain information or a notification.

USSD Call Flow – GSM & BEYOND ……

Although many of these USSD services are still in the nascent fllw, this technology has a huge potential for growth. If the application decides to terminate the dialogue, the network side sends a release complete message. With growing competition in the telecom industry, operators must be diligent in how they price both new and existing services. If the application decides to terminate the dialogue, the network side sends a release fllw message. The application, as an option, may request further information in order to perform the requested operation or terminate the dialogue.

The application server implementation is vendor dependent. In a mobile-initiated service request, a session is created between the network and the mobile terminal.

But some of these newly introduced services are not recognized by older Mobile Stations MSs.