Bulk SMS Delivery Status Codes and their Meanings

  28 November 2014

Get the delivery report

Below is the list of the DLR status codes returned by the operators and what they mean. To get delivery report for messages sent, visit www.xmx1.com/dlr.

When SMS are sent, Message Delivery Confirmations (DLR) are returned to the initiating Mobile Unit (Phone) or the SMPP (Short Message Peer to Peer) server like the one being used by www.smartsmssolutions.com. The DLRs are receipts that indicate status of messages you submitted. For more information on Delivery Report, please click here.

 

Code

Meaning

DELIVRD

Message was delivered to cell phone.

SENT

Message was sent to the operator but yet to get any DLR

PENDING

Message has been forwarded to the phone number and possibly delivered but the recipient's phone is yet to reply the operator with acknowledgement

ACKED

Message was sent to the operator and acknowledged by the operator

ACCEPTED

Message was accepted by the operator for delivery

ENQUEUE

Message was sent to the operator and forwarded to the cell phone but yet to reply with Delivery Acknowledgement.

ENROUTE

Message is being routed for delivery

UNKNOWN

The message has been confirmed as undelivered but no detailed information related to the failure is known.

An unknown error might have occurred on the operator SMS server.

This can also be generated as a result of PORTABILITY error

UNDELIV

Attempt to deliver message failed.

- Handset might be out of network coverage when message delivery was attempted.

- Handset might be switched off.

- Handset might be roaming out of carrier's supported network.

- The message might have failed due to suspicion of SPAM on the operator network eg sender ID relating to financial institutions or government agencies.

- Random unsolicited messages blocked by the operator

- Political campaign not permitted by the operator

- Same message sent to the same phone number repeatedly over a short time

- Absent phone number. The phone number might have been recycled after a period of no activity

- Low or no network coverage

- Battery too low to process incoming message

EXPIRED

The SMSC was unable to deliver the message in a specified amount of time. This is called Message Validity and it is usually 48 hours.

In some instances (especially when the operator is under traffic pressure), the operator might expire some messages instantly once it cannot be delivered as at first attempt.

It can also mean that the cell phone was switched off as at the time of delivery.

REJECTD

The message was rejected.

- Subscriber is on the Do-Not-Disturb list

- The provider could have blocked phone numbers in this range.

- Message flagged as SPAM (Mass unsolicited messages)

- Message flagged as SCAM (Messages with potential intent to defraud, defame or threatens social security)

- Faulty or ongoing upgrade on the base station covering the range of the phone number

DELETED

Message was deleted

UNSUPPORTED

Delivery report is not supported by the route or the operator

 

Note : Sometimes you might get false positives (i.e. DELIVRD status but no message on the phone when the inbox is full or due to portability issues)

 

 

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Message Delivery Status and Meaning

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