SMPP Data Coding Scheme

Data Coding Scheme Values

DCS values signify the Data Coding Scheme you have set to pass your messages to Messaggio. See the industry-universal list of DCS values below.

esm_class Parameter

The esm_class parameter is used to indicate special message attributes associated with SMS

Default Setting: 0x00.

• If an ESME encodes GSM User Data Header information in the short message user data, it must set the UDHI flag in the esm_class field.
• If the SMSC delivers a short message that contains GSM User Data Header information encoded in the short_message or message_payload parameter, it must set the UDHI flag in
  the esm_class field.
• For GSM networks, the concatenation related optional parameters (sar_msg_ref_num, sar_total_segments, sar_segment_seqnum) or port addressing related optional parameters (source_port, destination_port) cannot be used in conjunction with encoded User Data Header in the short_message (user data) field. This means that the above listed optional
  parameters cannot be used if the User Data Header Indicator flag is set.

ESME -> SMSC PDU Encoding

esm_class is encoded as follows in the submit_sm, submit_multi and data_sm (ESME -> SMSC) PDUs:

SMSC -> ESME PDU Encoding

The esm_class parameter is encoded as follows in a deliver_sm and data_sm (SMSC -> ESME) PDUs:

**Note:**\ All unlisted values for bits 5-2 and 7-6 are reserved.