First octet of the SMS-DELIVER PDU
The first octet of the SMS-DELIVER PDU has the following layout:
Bit no
7
6
5
4
3
2
1
0
Name
TP-RP
TP-UDHI
TP-SRI
(unused)
(unused)
TP-MMS
TP-MTI
TP-MTI
where the fields have the following meaning:
Name
Meaning
TP-RP
Reply path. Parameter indicating that reply path exists.
TP-UDHI
User data header indicator. This bit is set to 1 if the User Data field starts with a header
TP-SRI
Status report indication. This bit is set to [...]
The following link is AT commands interface document v90
This document describes the messages exchanged between an external application module and the WAVECOM GSM mobile station, based on AT commands in order to control incoming and outgoing calls.
This document presents the AT-commands implemented for the voice call teleservice, the data teleservice and the short message teleservice.
AT [...]
The Type-of-Address octet
The Type-of-Address octet indicates the format of a phone number. The most common value of this octet is 91 hex (10010001 bin), which indicates international format. A phone number in international format looks like 46708251358 (where the country code is 46). In the national (or unknown) format the same phone number would look [...]
SMS and the PDU format
Introduction
The SMS message, as specified by the Etsi organization (documents GSM 03.40 and GSM 03.38), can be up to 160 characters long, where each character is 7 bits according to the 7-bit default alphabet. Eight-bit messages (max 140 characters) are usually not viewable by the phones as [...]