SMS PDU-Mode
First octet of the SMS-SUBMIT PDU

The first octet of the SMS-SUBMIT PDU has the following layout:

Bit no	7	6	5	4	3	2	1	0
Name	TP-RP	TP-UDHI	TP-SRR	TP-VPF	TP-VPF	TP-RD	TP-MTI	TP-MTI

where the fields have the following meaning:

Fieldname	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-SRR	Status report request. This bit is set to 1 if a status report is requested
TP-VPF	Validity Period Format. Bit4 and Bit3 specify the TP-VP field according to this table: bit4 bit3 0 0 : TP-VP field not present 1 0 : TP-VP field present. Relative format (one octet) 0 1 : TP-VP field present. Enhanced format (7 octets) 1 1 : TP-VP field present. Absolute format (7 octets)
TP-RD	Reject duplicates. Parameter indicating whether or not the SC shall accept an SMS-SUBMIT for an SM still held in the SC which has the same TP-MR and the same TP-DA as a previously submitted SM from the same OA.
TP-MTI	Message type indicator. Bits no 1 and 0 are set to 0 and 1 respectively to indicate that this PDU is an SMS-SUBMIT

Example

A first octet of "11" (hex) has the following meaning:

Bit no	7	6	5	4	3	2	1	0
Name	TP-RP	TP-UDHI	TP-SRR	TP-VPF	TP-VPF	TP-RD	TP-MTI	TP-MTI
Value	0	0	0	1	0	0	0	1