| smpp.SC_interface_version | SMSC-supported version | String | Version of SMPP interface supported by the SMSC. |
| smpp.additional_status_info_text | Information | String | Description of the meaning of a response PDU. |
| smpp.addr_npi | Numbering plan indicator | Unsigned 8-bit integer | Gives the numbering plan this address belongs to. |
| smpp.addr_ton | Type of number | Unsigned 8-bit integer | Indicates the type of number, given in the address. |
| smpp.address_range | Address | String | Given address or address range. |
| smpp.alert_on_message_delivery | Alert on delivery | No value | Instructs the handset to alert user on message delivery. |
| smpp.callback_num | Callback number | No value | Associates a call back number with the message. |
| smpp.callback_num.pres | Presentation | Unsigned 8-bit integer | Controls the presentation indication. |
| smpp.callback_num.scrn | Screening | Unsigned 8-bit integer | Controls screening of the callback-number. |
| smpp.callback_num_atag | Callback number - alphanumeric display tag | No value | Associates an alphanumeric display with call back number. |
| smpp.command_id | Operation | Unsigned 32-bit integer | Defines the SMPP PDU. |
| smpp.command_length | Length | Unsigned 32-bit integer | Total length of the SMPP PDU. |
| smpp.command_status | Result | Unsigned 32-bit integer | Indicates success or failure of the SMPP request. |
| smpp.data_coding | Data coding | Unsigned 8-bit integer | Defines the encoding scheme of the message. |
| smpp.delivery_failure_reason | Delivery failure reason | Unsigned 8-bit integer | Indicates the reason for a failed delivery attempt. |
| smpp.dest_addr_npi | Numbering plan indicator (recipient) | Unsigned 8-bit integer | Gives recipient numbering plan this address belongs to. |
| smpp.dest_addr_subunit | Subunit destination | Unsigned 8-bit integer | Subunit address within mobile to route message to. |
| smpp.dest_addr_ton | Type of number (recipient) | Unsigned 8-bit integer | Indicates recipient type of number, given in the address. |
| smpp.dest_bearer_type | Destination bearer | Unsigned 8-bit integer | Desired bearer for delivery of message. |
| smpp.dest_network_type | Destination network | Unsigned 8-bit integer | Network associated with the destination address. |
| smpp.dest_telematics_id | Telematic interworking (dest) | Unsigned 16-bit integer | Telematic interworking to be used for message delivery. |
| smpp.destination_addr | Recipient address | String | Address of SME receiving this message. |
| smpp.destination_port | Destination port | Unsigned 16-bit integer | Application port associated with the destination of the message. |
| smpp.display_time | Display time | Unsigned 8-bit integer | Associates a display time with the message on the handset. |
| smpp.dl_name | Distr. list name | String | The name of the distribution list. |
| smpp.dlist | Destination list | No value | The list of destinations for a short message. |
| smpp.dlist_resp | Unsuccesfull delivery list | No value | The list of unsuccesfull deliveries to destinations. |
| smpp.dpf_result | Delivery pending set? | Unsigned 8-bit integer | Indicates whether Delivery Pending Flag was set. |
| smpp.error_code | Error code | Unsigned 8-bit integer | Network specific error code defining reason for failure. |
| smpp.error_status_code | Status | Unsigned 32-bit integer | Indicates success/failure of request for this address. |
| smpp.esm.submit.features | GSM features | Unsigned 8-bit integer | GSM network specific features. |
| smpp.esm.submit.msg_mode | Messaging mode | Unsigned 8-bit integer | Mode attribute for this message. |
| smpp.esm.submit.msg_type | Message type | Unsigned 8-bit integer | Type attribute for this message. |
| smpp.esme_addr | ESME address | String | Address of ESME originating this message. |
| smpp.esme_addr_npi | Numbering plan indicator (ESME) | Unsigned 8-bit integer | Gives the numbering plan this address belongs to. |
| smpp.esme_addr_ton | Type of number (ESME) | Unsigned 8-bit integer | Indicates recipient type of number, given in the address. |
| smpp.final_date | Final date | Date/Time stamp | Date-time when the queried message reached a final state. |
| smpp.final_date_r | Final date | Time duration | Date-time when the queried message reached a final state. |
| smpp.interface_version | Version (if) | String | Version of SMPP interface supported. |
| smpp.its_reply_type | Reply method | Unsigned 8-bit integer | Indicates the handset reply method on message receipt. |
| smpp.its_session.ind | Session indicator | Unsigned 8-bit integer | Indicates whether this message is end of conversation. |
| smpp.its_session.number | Session number | Unsigned 8-bit integer | Session number of interactive teleservice. |
| smpp.its_session.sequence | Sequence number | Unsigned 8-bit integer | Sequence number of the dialogue unit. |
| smpp.language_indicator | Language | Unsigned 8-bit integer | Indicates the language of the short message. |
| smpp.message | Message | No value | The actual message or data. |
| smpp.message_id | Message id. | String | Identifier of the submitted short message. |
| smpp.message_payload | Payload | No value | Short message user data. |
| smpp.message_state | Message state | Unsigned 8-bit integer | Specifies the status of the queried short message. |
| smpp.more_messages_to_send | More messages? | Unsigned 8-bit integer | Indicates more messages pending for the same destination. |
| smpp.ms_availability_status | Availability status | Unsigned 8-bit integer | Indicates the availability state of the handset. |
| smpp.ms_validity | Validity info | Unsigned 8-bit integer | Associates validity info with the message on the handset. |
| smpp.msg_wait.ind | Indication | Unsigned 8-bit integer | Indicates to the handset that a message is waiting. |
| smpp.msg_wait.type | Type | Unsigned 8-bit integer | Indicates type of message that is waiting. |
| smpp.network_error.code | Error code | Unsigned 16-bit integer | Gives the actual network error code. |
| smpp.network_error.type | Error type | Unsigned 8-bit integer | Indicates the network type. |
| smpp.number_of_messages | Number of messages | Unsigned 8-bit integer | Indicates number of messages stored in a mailbox. |
| smpp.opt_param | Optional parameters | No value | The list of optional parameters in this operation. |
| smpp.password | Password | String | Password used for authentication. |
| smpp.payload_type | Payload | Unsigned 8-bit integer | PDU type contained in the message payload. |
| smpp.priority_flag | Priority level | Unsigned 8-bit integer | The priority level of the short message. |
| smpp.privacy_indicator | Privacy indicator | Unsigned 8-bit integer | Indicates the privacy level of the message. |
| smpp.protocol_id | Protocol id. | Unsigned 8-bit integer | Protocol identifier according GSM 03.40. |
| smpp.qos_time_to_live | Validity period | Unsigned 32-bit integer | Number of seconds to retain message before expiry. |
| smpp.receipted_message_id | SMSC identifier | String | SMSC handle of the message being received. |
| smpp.regdel.acks | Message type | Unsigned 8-bit integer | SME acknowledgement request. |
| smpp.regdel.notif | Intermediate notif | Unsigned 8-bit integer | Intermediate notification request. |
| smpp.regdel.receipt | Delivery receipt | Unsigned 8-bit integer | SMSC delivery receipt request. |
| smpp.replace_if_present_flag | Replace | Unsigned 8-bit integer | Replace the short message with this one or not. |
| smpp.reserved_op | Optional parameter - Reserved | No value | An optional parameter that is reserved in this version. |
| smpp.sar_msg_ref_num | SAR reference number | Unsigned 16-bit integer | Reference number for a concatenated short message. |
| smpp.sar_segment_seqnum | SAR sequence number | Unsigned 8-bit integer | Segment number within a concatenated short message. |
| smpp.sar_total_segments | SAR size | Unsigned 16-bit integer | Number of segments of a concatenated short message. |
| smpp.schedule_delivery_time | Scheduled delivery time | Date/Time stamp | Scheduled time for delivery of short message. |
| smpp.schedule_delivery_time_r | Scheduled delivery time | Time duration | Scheduled time for delivery of short message. |
| smpp.sequence_number | Sequence # | Unsigned 32-bit integer | A number to correlate requests with responses. |
| smpp.service_type | Service type | String | SMS application service associated with the message. |
| smpp.set_dpf | Request DPF set | Unsigned 8-bit integer | Request to set the DPF for certain failure scenario's. |
| smpp.sm_default_msg_id | Predefined message | Unsigned 8-bit integer | Index of a predefined ('canned') short message. |
| smpp.sm_length | Message length | Unsigned 8-bit integer | Length of the message content. |
| smpp.source_addr | Originator address | String | Address of SME originating this message. |
| smpp.source_addr_npi | Numbering plan indicator (originator) | Unsigned 8-bit integer | Gives originator numbering plan this address belongs to. |
| smpp.source_addr_subunit | Subunit origin | Unsigned 8-bit integer | Subunit address within mobile that generated the message. |
| smpp.source_addr_ton | Type of number (originator) | Unsigned 8-bit integer | Indicates originator type of number, given in the address. |
| smpp.source_bearer_type | Originator bearer | Unsigned 8-bit integer | Bearer over which the message originated. |
| smpp.source_network_type | Originator network | Unsigned 8-bit integer | Network associated with the originator address. |
| smpp.source_port | Source port | Unsigned 16-bit integer | Application port associated with the source of the message. |
| smpp.source_telematics_id | Telematic interworking (orig) | Unsigned 16-bit integer | Telematic interworking used for message submission. |
| smpp.system_id | System ID | String | Identifies a system. |
| smpp.system_type | System type | String | Categorises the system. |
| smpp.user_message_reference | Message reference | Unsigned 16-bit integer | Reference to the message, assigned by the user. |
| smpp.user_response_code | Application response code | Unsigned 8-bit integer | A response code set by the user. |
| smpp.ussd_service_op | USSD service operation | Unsigned 8-bit integer | Indicates the USSD service operation. |
| smpp.validity_period | Validity period | Date/Time stamp | Validity period of this message. |
| smpp.validity_period_r | Validity period | Time duration | Validity period of this message. |
| smpp.vendor_op | Optional parameter - Vendor-specific | No value | A supplied optional parameter specific to an SMSC-vendor. |