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USSD vs SMS Technology: Learn the Similarities and Differences

This article gives you hints on the Unstructured Supplementary Services Data (USSD) that is a GSM service. It allows high speed interactive communication among subscribers and applications. Often USSD is considered to be similar to SMS service, however, USSD is session oriented, unlike SMS. Learn more…

USSD is similar to SMS technology in the way that USSD also allows to send and receive short text messages but as it was mentioned, it is session oriented. This way, USSD gives a very short delay between sending the query and receiving the response. As a result, it can provide text content as a service.

For USSD services, lustra piotrków trybunalski łódzkie fabryki w polsce an USSD Gateway is required. This gateway enables operators to introduce messaging services with USSD as the bearer, gaining faster response times. In this case, the platform is complementary to SMS service and an SMS gateway. The USSD gateway transfers USSD messages up to 182 characters between the applications and the GSM network.

Both the SMS and USSD technology employ the signaling channel to be the bearer by default. Unlike SMS, USSD is not able to provide a store and forward functionality. It is a real time session-oriented service. It means that once a user gets access to a service with USSD, a session is established and the radio connection stays open until the user, application or time out releases it. This way, USSD is able to provide faster response times that is ideal for interactive applications. An USSD session needs to be allocated to each and every interaction.

USSD holds a great advantage over SMS technology: the USSD is available in roaming networks and USSD messages are directed to the subscriber's Home Network itself.

An USSD gateway is able to communicate with GSM network entities, such as the HLR using SS7 (Signaling System 7) protocol stacks MAP (Mobile Application Part). The USSD gateway receives and sends out session IDs from the session ID pool, and maintains and destroys the sessions The MAP (Mobile Application Part) layer is present both on the server and on the mobile phones.

The primary task of the USSD gateway is to wait for messages arriving from the MAP layer. Then it routes these messages into a content provider system through SMPP or HTTP or any other available way. The USSD gateway can also push messages. So, it can be used for simple notifications as well as interactive dialogs due to the supported 1-way and 2-way mobile sessions.

It is also important to discuss some further terms: PSSR, USSN and USSR. Unstructured Supplementary Service Request (USSR) is a message that can be used to initiate a session by the USSD gateway to the mobile user.

For example, Ozeki NG SMS Gateway is an SMS gateway software but not an USSD gateway. However, it can function as a client for USSD services by sending and receiving USSD messages on supported GSM modems.

In order to send an USSD request using Ozeki NG SMS Gateway, all you need to do is to send an SMS:TEXT message and you should put the USSD information into the recipient number field. This SMS gateway allows you to send USSD from the user interface and from any application for example you can use a database server to send USSD requests. Often responses to USSD requests are sent back by the network in an SMS message. (More information:

Source: (The official website of Ozeki NG SMS Gateway)

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