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Presence of User Data Header is indicated by the TP-UDHI (Transfer Layer Protocol User Data Header Indicator) bit - 6th bit of the first octet of the GSM 03.40 or 3GPP 23.040 message. If UDH is present, it is at the beginning of the TP-UD (TP-User Data) field and it always starts with an UDHL (UDH Length) octet.
GSM 03.40 or 3GPP TS 23.040 is a mobile telephony standard describing the format of the Transfer Protocol Data Units (TPDU) part of the Short Message Transfer Protocol (SM-TP) used in the GSM networks to carry Short Messages. [1]
In technical terms, the concatenated SMS could also be referred to as a PDU Mode SMS [dubious – discuss].The number of parts that a multi-part or PDU mode SMS message may contain depends technically upon a header message but mostly upon the device sending or receiving the SMS and also upon the service provider.
User Data Header, a binary structure at the start of some short messages in cell phones Universal derailleur hanger , a standard for attaching rear derailleurs on bicycles Medicine and biology
The length field is set to zero if the length of the UDP header plus UDP data is greater than 65,535. [9] Checksum: 16 bits The checksum field may be used for error-checking of the header and data. This field is optional in IPv4, and mandatory in most cases in IPv6. [10] Data: Variable The payload of the UDP packet.
The Data Identifier word (along with the SDID, if used), indicates the type of ancillary data that the packet corresponds to. Data identifiers range from 1 to 255 (FF hex), with 0 being reserved. As the serial digital interface is a 10-bit format, the DID word is encoded as follows: Bits 0-7 (bit 0 being the LSB), are the raw DID value.
Data Coding Scheme is a one-octet field in Short Messages (SM) and Cell Broadcast Messages (CB) which carries a basic information how the recipient handset should process the received message. The information includes: the character set or message coding, which determines the encoding of the message user data
The form of encoding used to safely transfer the entity to the user. Currently defined methods are: chunked, compress, deflate, gzip, identity. Must not be used with HTTP/2. [14] Transfer-Encoding: chunked: Permanent RFC 9110: User-Agent: The user agent string of the user agent. User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko ...