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[ETSI Specification: GSM 03.40 Version 5.3.0: July 1996] Example of the UDH for an sms split into two parts: 05 00 03 CC 02 01 [ message ] 05 00 03 CC 02 02 [ message ] Note if a UDH is present and the data encoding is the default 7-bit alphabet, the user data must be 7-bit word aligned after the UDH. [2]
User Data Header (UDH) is a binary structure which may be present at the start of a short message in the Short Message Service in GSM.It does not contain any text, but it specifies how the message should be formatted and processed.
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;
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.
When there are 7 spare bits in the last octet of a message, these bits are set to the 7-bit code of the CR control (also used as a padding filler) instead of being set to zero (where they would be confused with the 7-bit code of an '@' character). This 7-bit encoding allows the transport of texts consisting of printable characters from Basic ...
An alternative to inbound SMS is based on long numbers (international mobile number format, e.g., +44 7624 805000, or geographic numbers that can handle voice and SMS, e.g., 01133203040 [44]), which can be used in place of short codes or premium-rated short messages for SMS reception in several applications, such as TV voting, [47] product ...
SMS-SUBMIT is used to submit a short message from a mobile phone (Mobile Station, MS) to a short message service centre (SMSC, SC). SMS-SUBMIT-REPORT is an acknowledgement to the SMS-SUBMIT; a success means that the message was stored (buffered) in the SMSC, a failure means that the message was rejected by the SMSC.
Note that the text in the short_message field must match the data_coding. When the data_coding is 8 (UCS2), the text must be in UCS-2BE (or its extension, UTF-16BE). When the data_coding indicates a 7-bit encoding, each septet is stored in a separate octet in the short_message field (with the most significant bit set to 0).