| Publisher | WAP Forum | ||
|---|---|---|---|
| Format | 176.0KB PDF | Date added | 15 Jul 1999 |
| Topics | Mobile - Wireless Communications, WAP | ||
| Downloads | 1241  popular | ||
Normally when standard GSM supplementary services are managed from the MS structured, functional signaling is available. For example, if the user activates the supplementary service Call Forwarding the MS recognizes this and invokes a standard signaling procedure towards the network. This is because the Call Forwarding supplementary service is part of the GSM standard.The supplementary services were introduced in stages into the GSM standard. To support old mobiles and Operator Specific Services, OSS, the container mechanism Unstructured Supplementary Service Data, USSD, was introduced into the GSM standard. The USSD operation can be used towards the network when the MS does not recognize the text string entered by the user. Further standardisation allowed the network to send USSD operations toward the MS, as well as combining mobile and network initiated operations in order to exchange data in a dialogue manner. Since the content of the operations sent from the network ends up on the MS display, and operations sent from the MS can be routed to an operator provided application in the network, USSD can be used as a transparent pipe through the GSM network.
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