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Short codes, or short numbers, are short digit-sequences—significantly shorter than telephone numbers—that are used to address messages in the Multimedia Messaging System (MMS) and short message service (SMS) systems of mobile network operators. [1] In addition to messaging, they may be used in abbreviated dialing.
SMS Control: 1: no 21: Hyperlink format element: SMS Control: 0-255: yes 22: Reply Address Element: SMS Control: 1-255: no 23: Enhanced Voice Mail Information: SMS Control: 0-255: no 24: National Language Single Shift: SMS Control: 1: no 25: National Language Locking Shift: SMS Control: 1: no 26 Filler SMS Control 0-255 yes 27 – 6F: Reserved ...
In mobile telephony GSM 03.38 or 3GPP 23.038 is a character encoding used in GSM networks for SMS (Short Message Service), CB (Cell Broadcast) and USSD (Unstructured Supplementary Service Data).
USSD (Unstructured Supplementary Service Data) codes [1] are mobile dial codes that can be used for communicating with the service provider's computers (i.e. for WAP browsing, prepaid callback service, mobile-money services, location-based content services, menu-based information services, and as part of configuring the phone on the network).
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A Short Message Service Center (SMSC) is a network element in the mobile telephone network. Its purpose is to store, forward, convert and deliver Short Message Service (SMS) messages. The full designation of an SMSC according to 3GPP is Short Message Service - Service Center (SMS-SC).8522076203
The value shall start at 1 and increment for every short message which makes up the concatenated short message. If the value is zero or greater than the value in Field 5 then the receiving entity shall ignore the whole information element. [ETSI Specification: GSM 03.40 Version 5.3.0: July 1996] Example of the UDH for an sms split into two parts:
The Short Message protocol itself is defined by 3GPP TS 23.040 for the Short Message Service - Point to Point (SMS-PP), [2] and 3GPP TS 23.041 for the Cell Broadcast Service (CBS). [3] Four MAP procedures are defined for the control of the Short Message Service: [1] Mobile Originated (MO) short message service transfer;