Chapter 15 · Part 2
SMS Delivery (DLR) Report
The Delivery Report (DLR) shows what happened to every SMS you sent — with a performance breakdown and a status for each message. Here’s how to read it and what each status means.
The Delivery Report
Open it from SMS → SMS DLR Report and filter by date. The top cards show your totals and delivery rate, and the performance charts split your messages by status — both by count and by percentage.
How a message travels
SMS delivery path
Pending
Queued on the iSMS server
Sent
Submitted to the telco SMSC
Delivered
Confirmed by the SMSC
The successful path. If a message can’t complete it, it shows as Undelivered or Fail instead (explained below).
What each status means
Sent
Submitted to the carrier’s SMSC and awaiting a delivery confirmation. It may already be delivered, but the SMSC hasn’t returned a final status.
Delivered
Delivered to the destination number and acknowledged by the carrier SMSC.
Undelivered
The validity period expired (phone off / out of coverage after all retries), or the number was inactive/untraceable, or the inbox was full.
Pending
Accepted by the iSMS server and queued for the carrier — not yet sent to the SMSC.
Fail
Rejected at the carrier SMSC — the destination network was unavailable or blocked. Failed SMS are not charged.