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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.
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.
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]
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
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.
In version 0, the signalling protocol (the protocol which sets up the tunnels by activating the PDP context) is combined with the tunnelling protocol on one port. Versions 1 and 2 are each effectively two protocols, one for control (called GTP-C) and one for user data tunneling (called GTP-U). GTP version 2 is different to version 1 only in GTP-C.
An email’s full headers include info about how it was routed and delivered and the true sender of the email. View the full headers to find out where an email was delayed or if the real sender disguised their email address. View the full header of an email. 1. Click an email to open it. 2. Click the More drop-down in the top menu. 3.
Requests a web application to disable their tracking of a user. This is Mozilla's version of the X-Do-Not-Track header field (since Firefox 4.0 Beta 11). Safari and IE9 also have support for this field. [25] On March 7, 2011, a draft proposal was submitted to IETF. [26] The W3C Tracking Protection Working Group is producing a specification. [27]