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

^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): 00 - field not present; 10 - Relative format (one octet); 01 - Enhanced format (7 octets); 11 - 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|