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https://www.smssolutions.net/tutorials/smpp/smppdeliveryreports/
To detect whether a 'deliver_sm' is a delivery report or a message, you have to check the 'esm_class' field. If bit 2 of this byte is set ( 0x04 ), it is a delivery report. To use delivery reports, you have to setup a transceiver connection to the SMPP provider, because you are going to send and receive messages.
Mobile Terminated (MT) SMS with delivery receipt using SMPP The SMPP (Short Message Peer-to-Peer) protocol is an open, industry standard protocol designed to provide a flexible data communications interface for the transfer of short message data between External Short Message Entities (ESME), Routing Entities (RE) and Message Centres (MC).
https://smpp.org/smpp-delivery-receipt.html
SMPP Delivery Receipts SMPP supports delivery receipts / reports (DLRs) for SMS messages so that your application can determine delivery outcomes. The returning of a message delivery receipt / report (DLR) is dependent on the value set in the registered_delivery field of the message originally sent from the ESME to the MC in an submit_sm operation.
https://stackoverflow.com/questions/18512444/message-id-for-sms-submission-and-delivery-not-the-same
Imagine the following connectivity (<> indicates a SMPP connectivity): ESME#1 <> SMSC#1 <> ESME#2. Here are some of the events that will take place: ESME#1 sends a submit_sm to SMSC#1 with delivery receipt request. SMSC#1 sends back a submit_sm_resp, with a message_id=1000 (which is generated by SMSC#1).
https://www.activexperts.com/sms-component/smpp-specifications/overview/
The SMSC Delivery Receipt is carried as the user data payload in the SMPP deliver_sm or data_sm operation. The following fields are relevant in the deliver_sm and data_sm operations when used for transmitting delivery receipts.
https://www.infobip.com/docs/essentials/smpp-specification
The Short Message Peer-to-Peer (SMPP) is an open, industry-standard protocol used by the telecommunication industry for exchanging SMS messages between SMS application systems and Short Message Service Centers (SMSC).
https://www.openmarket.com/docs/Content/apis/v3smpp/smpp-error-codes.htm
62 rows · Invalid submit with replace request; submit_sm with replace_if_present_flag set 0x00000043 …
http://docs.nimta.com/SMPP_v3_4_Issue1_2.pdf
any SMPP ‘server’ entity to which an SMPP ‘client’, termed an External Short Message Entity (ESME), can be connected. SMPP Release v3.4 supports Digital Cellular Network technologies including:-File Size: 1MB
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