messagingtoolkit

From the sample PDU that you attached in another thread, here is the output

PDU LENGTH IS 36 BYTES
ADDRESS OF DELIVERING SMSC
NUMBER IS : +62818445009
TYPE OF NR. : International
NPI : ISDN/Telephone (E.164/163)

MESSAGE HEADER FLAGS
MESSAGE TYPE : SMS SUBMIT
REJECT DUPLICATES : NO
VALIDITY PERIOD : RELATIVE
REPLY PATH : REQUESTED
USER DATA HEADER : PRESENT
REQ. STATUS REPORT : YES
MSG REFERENCE NR. : 194 (0xC2)

DESTINATION ADDRESS
NUMBER IS : 08974871102
TYPE OF NR. : Unknown
NPI : ISDN/Telephone (E.164/163)

PROTOCOL IDENTIFIER (0x00)
MESSAGE ENTITIES : SME-to-SME
PROTOCOL USED : Implicit / SC-specific

DATA CODING SCHEME (0x00)
AUTO-DELETION : OFF
COMPRESSION : OFF
MESSAGE CLASS : NONE
ALPHABET USED : 7bit default

VALIDITY OF MESSAGE : 60 min

USER DATA PART OF SM
USER DATA LENGTH : 16 septets
UDH LENGTH : 10 octets
UDH : 22 08 0B 81 80 91 12 22 22 F3
UDH ELEMENTS : 22 - Reply Address Element
8 (0x08) Bytes Information Element
Answer to 08192122223
USER DATA (TEXT) : woi

The reply path is set to 08192122223.

Please take note the reply path address is normally the SMSC address that you want the recipient to use when replying the message, and normally it should be in international format

<<
The reply path field is a 1-bit field in bit 7 of the octet in question. This
parameter says if a reply is requested from the receiving mobile station.
If a reply path is requested, the replying mobile station will try to use the
same Service Centre that the sending mobile use to ensure a better
chance of delivery of the reply. Also the recipient of the SMS may not
have SMS available on their subscription. Setting the reply path gives
them the opportunity to answer any SMS. Whichever party pays for the
reply may depend on the operator.
If this parameter is set to 1 then the reply path is set, otherwise, 0.>>