3GPP 23040 PDF
GSM or 3GPP TS is a mobile telephony standard describing the format of the Transfer Protocol Data Units (TPDU) of the Short Message Transfer . 3gppATechnical Realization of the Short Message Service . of 2T”& re istered for the benefit of its Members and of the 3GPP Or ani!ational Partners. The architecture for SMS is specified in 3GPP TS 3 and for SMS over IP from CSE 10 at Krishna Institute Of Engineering and Technology.
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GSM recognizes only 2 encodings for text messages and 1 encoding for binary messages:. Enhanced format of TP-VP field is seldom used. Longer messages can be split to multiple parts and sent as a Concatenated SMS. TP-PID Protocol identifier either refers to the higher layer protocol being used, indicates interworking with a certain type of 3gop device like faxtelexpagerteletexe-mailspecifies replace type of the message or allows download of configuration parameters to the SIM card.
Languages which use Latin scriptbut use characters which are not present in the GSM 7-bit default alphabet, often replace missing characters with diacritic marks with corresponding characters without diacritics, which causes not 3gppp satisfactory user experience, but is often accepted.
Although these changes are ancient version 6. The following 3 octets contain a relative validity period in hours, minutes and seconds as the 3rd to 5th octet of time format.
A special DCS values also allows message compressionbut it perhaps is not used by any operator. For example, a fictional alphanumeric address Design Home is converted to the GSM 7-bit default alphabet which yields 11 bytes 44 65 73 69 67 6E 00 48 6F 6D 65 hexthe 7-bit packing transforms it to 77 bits stored in 10 octets as C4 F2 3C 7D 76 03 90 EF 76 19; 2304 bits is 20 nibbles 14 hex which is the value of the first octet of the address.
However, no such extensions are defined. This format is used throughout the whole transfer of the message in the GSM mobile network. Retrieved from ” https: These characters form GSM 7-bit default alphabet extension table. 3gp
Message Waiting Indication group of DCS values can set or reset flags of indicating presence of unread voicemailfaxe-mail or other messages. Bit 3 is 1, therefore the time zone is negative. Time zone is given in quarters of an hour.
In this example, the time zone, 8A is binary Other addresses are carried by lower layers. It has always 7 octets, although some of them are not used.
GSM – Wikipedia
The remaining number bit-wise ‘and’ with ishexadecimal The absolute format is identical to the other time formats in GSM The non-segmented message using national language shift table s may carry up to or 7-bit characters. The following octet is a relative validity period as described in the Relative Validity Period Values table. The MSC usually does not close the connection to the mobile phone and does not end the MAP dialogue with the SMSC, which allows faster delivery of subsequent messages or message segments.
Any handset must be able to 33gpp such short message irrespective of whether there is memory available in the U SIM or ME or not, must acknowledge receipt of the message, but must not indicate its receipt 3fpp the user and must discard its contents, so the message will not be stored in the U SIM or ME.
However, a GSM Alphanumeric address is at first put to the GSM 7-bit default alphabet, then encoded the same way as any message text in TP-UD field that means it is 7-bit packed and then the address is supplied with the “number” length and TON and NPI. In this case the number must adhere to the mobile operator’s dial planwhich means that international numbers must have the international prefix 00 in most countries, but in the USA before the country code and numbers for long-distance calls must start with the trunk prefix 0 in most countries, 1 in the USA followed by a trunk code.
The 3tpp itself must always start with a country code and must be formatted exactly according to the E.
www.3gpp.org – /ftp/Specs/archive/23_series/23.040/
Such message may be sent only if the original message had this flag cleared and the new message must 3gp sent with the flag set. Treat this as any previous element in the sequence, hex 82 represents number However, the validity period is usually limited globally by the SMSC configuration parameter— often to 48 or 72 hours.
When the message encoding is GSM 7-bit default alphabet and a UDH is present, fill bits are inserted to align start of the first character of the text after UDH with septet boundary. From Wikipedia, the free encyclopedia. The TP-DCS octet has a complex syntax to allow carrying of other information; the most notable are message classes:.
The value of 1 in the bit 7 of the first octet indicates that TP-VP 3gp indicator extends to another octet. If the time zone offset is negative in Western hemisphere bit 3 of the last octet is set to 1.
They are not stored in the phone, they just displayed on the phone display. If the originator and the recipient home networks differ, the reply would go through another SMSC then usually.