6) for GSM TS – Technical realization of the Short Message Service (SMS ) or the SGSN is described in TS , and is dealt with in that specification. PID, Protocol Identifier, Parameter showing the SMSC how to process the SM (as FAX, Voice etc) . (For further information see GSM chapter ). TP-PID: TP-Protocol-Identifier. . This document gives only a very simple description of SMS in PDU mode. . See GSM TP-PID complete definition. 1 0.

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Length of SMSC information.

SMS Messaging

To read a SMS message from a particular location in memory eg. The phone number in semi octets 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 fields of SM-TP messages, including their order and size, are summarized in the specificztion table, where M means a mandatory field, O an optional field, E is used for fields which are mandatory in negative responses RP-ERR and not present in positive responses RP-ACKx is a field present elsewhere:.

The “00” value here lets the phone set the message reference number itself. If the time zone offset is negative in Western hemisphere bit 3 of the last octet is set to 1. When this alphabet is used, eight characters of the message are packed in seven octets, and the message can consist of up to characters instead of characters in 8-bit data coding.

Setting the TP-RP bits turns on a feature which allows to send a reply for a message using the same path as the original message. Length of phone number In this example, the time zone, 8A is binary The absolute format is identical to the other time formats in GSM The value of 1 in the bit 7 of the first octet indicates that TP-VP functionality indicator speciification to another octet. This message is coded according to the 7bit default alphabet.


They are not stored in the phone, they just displayed on the phone display. The content of the message its text when the message is not a binary one is carried in the TP-UD field. A special DCS values also allows message compressionbut it perhaps is not used by sma operator.

Note that this has the length 10 Awhich is even. Its 3 least significant bits have the following meaning:. In all octets the values are stored in binary coded decimal format with switched digits number 35 is stored as 53 hex.

The MR field gives an integer GSM recognizes only 2 encodings for text messages and 1 encoding for binary messages:. The SMS message can be deleted from memory eg.

Longer messages can be split to multiple parts and sent as a Concatenated SMS. You will then need to enter the destination number for the SMS message. In the second case, the VP comprises 7 octets, giving the absolute time of the vality period termination. It has always 7 octets, although some of them are not used.

The VP field is given in either integer or semi-octet representation. The octet is then coded as follows:. 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. Bit 3 is 1, therefore the time zone is negative. Such message spedification be sent speciffication if the original message had this flag cleared and the new message must be sent with the flag set.

In time the Class 2 is supported, if you choose Class 1 or Class 3 the short message is sme the same way as a Class 2 message. This octet is optional.


However, SMS message can be sent out or received in a similar fashion using other mobile phones.

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 entirely satisfactory user experience, but is often accepted.

However, the validity period is usually limited globally by the SMSC configuration parameter— often to 48 or 72 hours.

The TP-DCS octet has a complex specificaion to allow carrying of other information; the most notable are message classes:. The value of 1 in the bit 6 of the first octet means that the message is Single-shot. From Wikipedia, the free encyclopedia. The alphabet contains the most-often used symbols from most Western-European languages and some Greek uppercase letters.

These octets represent the message “hellohello”.

SMS messages and the PDU format

The Validity Period parameter value indicates the time period for which the short message is valid, i. The number itself must always start with a country code and must be specificatio exactly according to the E. These characters form GSM 7-bit default alphabet extension table.

This format is used throughout the whole transfer of the message in the GSM mobile network. The UDL field gives an integer representation of the number of characters within the User Data field to follow.

This service enables the SM-AL to ssm short messages to its peer entity, receive short messages from its peer entity and receive reports about earlier requests for short messages to be transferred. Insert a SIM card into the mobile phone and turn the phone on.