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.
UDH can be used to form Concatenated SMS, to enrich the content of the message with colors, text formatting, small pictures and animations and simple music which are used in Enhanced Messaging Service (EMS), to convey port numbers which may cause start of an application in the mobile phone, which is used for Multimedia Messaging Service (MMS) or to indicate using of national language shift tables.[1]
UDH is defined in 3GPP 23.040 (originally GSM 03.40).[2]
^"Alphabets and language-specific information". portal.3gpp.org. Retrieved 2021-07-19.
^3rd Generation Partnership Project; Technical realization of the Short Message Service (SMS)
UserDataHeader (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...
numbers to a receiver. In this case, the UserDataHeader shall be: Field 1 (1 octet): Length of UserDataHeader (UDL), in this case 06. Field 2 (1 octet):...
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HTTP header field, designed to allow internet users to opt-out of tracking by websites—which includes the collection of data regarding a user's activity...
an IP network. IP packets consist of a header for addressing and routing, and a payload for userdata. The header contains information about IP version...
with a national table(s) according to special information elements in UserDataHeader. The non-segmented message using national language shift table(s) may...
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layers: transfer of user plane data; transfer of control plane data; header compression; ciphering; integrity protection. The header compression technique...
private name to avoid clashing with user names, but the more ordinary name atomic can be used if the <stdatomic.h> header is included. Of these, const is...
blocks of data created by a web server while a user is browsing a website and placed on the user's computer or other device by the user's web browser...
used by the reader's mail user agent to store the attachment. The following example is taken from RFC 2183, where the header field is defined: Content-Disposition:...
website address. Some web browsers give their users the option to turn off referrer fields in the request header. Most web browsers do not send the referrer...
(RFC 6585) The user has sent too many requests in a given amount of time. Intended for use with rate-limiting schemes. 431 Request Header Fields Too Large...
using multiple messages, in which case each message will start with a UserDataHeader (UDH) containing segmentation information. Since UDH is part of the...
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to the user agent via an HTTP response header field named Strict-Transport-Security. HSTS Policy specifies a period of time during which the user agent...
payload of userdata. The control information in IPv6 packets is subdivided into a mandatory fixed header and optional extension headers. The payload...
packet is a formatted unit of data carried by a packet-switched network. A packet consists of control information and userdata; the latter is also known...
These included files are called header files or copybooks. They are often used to define the physical layout of program data, pieces of procedural code, and/or...
lengthens latency. Applications that do not require reliable data stream service may use the User Datagram Protocol (UDP) instead, which provides a connectionless...
envelope and content; the content consists of a header and a body. Computer-based messaging between users of the same system became possible after the advent...
IPv4 header and the Next Header field of the IPv6 header. It is an identifier for the encapsulated protocol and determines the layout of the data that...