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How is an SMPP delivery report formatted?

In SMPP a delivery report is an SMS message.

There are just two differences:

  • A Delivery report has the ‘ESM_2ESME_DELIVERY_RECEIPT’ bit (4) set high in the ESM Class property.
  • The delivery report has a special format.

While there is no standard format for delivery reports this is the de-facto standard:

id:IIIIIIIIII sub:SSS dlvrd:DDD submit date:YYMMDDhhmm done
date:YYMMDDhhmm stat:DDDDDDD err:E Text: .........

This example is from the SMPP 3.4 specification.

The body encodes the following fields:

Field Size Type Description
id 10 C-Octet The message ID allocated to the message by the SMSC when originally submitted.
sub 3 C-Octet Number of short messages originally submitted. This is only relevant when the original message was submitted to a distribution list. The value is padded with leading zeros if necessary.
dlvrd 3 C-Octet Fixed Length String Number of short messages delivered. This is only relevant where the original message was submitted to a distribution list. The value is padded with leading zeros if necessary.
submit date 10 C-Octet Fixed Length String The time and date at which the short message was submitted. In the case of a message which has been replaced, this is the date that the original message was replaced. The format is as follows:
YYMMDDhhmm where:

  • YY = last two digits of the year (00-99)
  • MM = month (01-12)
  • DD = day (01-31)
  • hh = hour (00-23)
  • mm = minute (00-59)
done date 10 C-Octet Fixed Length String The time and date at which the short message reached it’s final state. The format is the same as for the submit date.
stat 7 C-Octet Fixed Length String The final status of the message. For settings for this field see table below.
err 3 C-Octet Fixed Length String Where appropriate this may hold a Network specific error code or an SMSC error code for the attempted delivery of the message. These errors are Network or SMSC specific and are not included here.
text 20 Octet String The first 20 characters of the short message.

Delivery report status (stat field):

Message State Final States Description
Message State Final States Description
DELIVERED DELIVRD Message is delivered to destination
EXPIRED EXPIRED Message validity period has expired.
DELETED DELETED Message has been deleted.
UNDELIVERABLE UNDELIV Message is undeliverable
ACCEPTED ACCEPTD Message is in accepted state (i.e. has been manually read on behalf of the subscriber by customer service)
UNKNOWN UNKNOWN Message is in invalid state
REJECTED REJECTD Message is in a rejected state