SMS PDU-Mode
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 1 if a status report is going to be returned to the SME
TP-MMS	More messages to send. This bit is set to 0 if there are more messages to send
TP-MTI	Message type indicator. Bits no 1 and 0 are both set to 0 to indicate that this PDU is an SMS-DELIVER

Example

A first octet of "04" (hex) has the following meaning:

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
Value	0	0	0	0	0	1	0	0