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Optional Fields

Optional fields in SMPP, known as Tag-Length-Value (TLV) parameters, provide additional flexibility and functionality beyond the required fields. These parameters are not mandatory for all operations but can be included to support specific features such as delivery receipts, callback numbers, or extended message attributes.

All optional fields appear at the end of the PDU, in a designated optional parameters section. Within that section, fields can be encoded in any order. Depending on the use case, a PDU may include some, all, or none of the available optional fields. For example, a system submitting a message via submit_sm might include only a callback number TLV, while others may require multiple additional parameters.

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