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Construction of SMS PDU’s
LZT 123 7632 R1A
8
4 SMS-Submit
Recall that an SMS-SUBIT type PDU is what we want to send to another
mobile. It is what we “submit” to the service centre to be delivered to the
chosen destination.
To understand the various field of a TPDU of type SMS-SUBMIT it is best
to begin with an example and then break the TPDU down into its various
fields. Also we will consider the whole PDU (PDU = SCA + TPDU) when
discussing SMS-SUBMIT and SMS-DELIVER type TPDU’s.
We can begin with the example from the earlier sections:
07916407058099F911000A8170607896200000A71554747A0E4ACF416
110945805B5CBF379F85C06
We can start by breaking it down into the various fields:
4.1 The Service Center Address (SCA)
07916407058099F9
11000A8170607896200000A71554747A0E4ACF416
110945805B5CBF379F85C06
This is the Service Centre Address (SCA). It has its own special address
field. We can break it down as follows:
BINARY REPRESENTATION
OCTET
7 6 5 4 3 2 1 0
FIELD MEANING
07 0 0 0 0 0 1 1 1
ADDRESS LENGTH: This
octet declares the number
of octets to follow.
91
1
0
0
1
0
0
0
1
This is the Type of Address
field. There are two different
fields in this octet. Bits 0-3
are the Numbering plan
Identification. Bits 4-6 are
the Type of Number. Bit 7 is
a fill bit. See below for more
details.
64
0
1
1
0
0
1
0
0
The digits 4 and 6
07
0
0
0
0
0
1
1 1
The digits 7 and 0
05
0
0
0
0
0
1
0
1
The digits 5 and 0
80
1
0
0
0
0
0
0
0
The digits 0 and 8
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