| wtp.RID | Re-transmission Indicator | Boolean | Re-transmission Indicator |
| wtp.TID | Transaction ID | Unsigned 16-bit integer | Transaction ID |
| wtp.TID.response | TID Response | Boolean | TID Response |
| wtp.abort.reason.provider | Abort Reason | Unsigned 8-bit integer | Abort Reason |
| wtp.abort.reason.user | Abort Reason | Unsigned 8-bit integer | Abort Reason |
| wtp.abort.type | Abort Type | Unsigned 8-bit integer | Abort Type |
| wtp.ack.tvetok | Tve/Tok flag | Boolean | Tve/Tok flag |
| wtp.continue_flag | Continue Flag | Boolean | Continue Flag |
| wtp.fragment | WTP Fragment | No value | WTP Fragment |
| wtp.fragment.error | Defragmentation error | No value | Defragmentation error due to illegal fragments |
| wtp.fragment.multipletails | Multiple tail fragments found | Boolean | Several tails were found when defragmenting the packet |
| wtp.fragment.overlap | Fragment overlap | Boolean | Fragment overlaps with other fragments |
| wtp.fragment.overlap.conflict | Conflicting data in fragment overlap | Boolean | Overlapping fragments contained conflicting data |
| wtp.fragment.toolongfragment | Fragment too long | Boolean | Fragment contained data past end of packet |
| wtp.fragments | WTP Fragments | No value | WTP Fragments |
| wtp.header.TIDNew | TIDNew | Boolean | TIDNew |
| wtp.header.UP | U/P flag | Boolean | U/P Flag |
| wtp.header.missing_packets | Missing Packets | Unsigned 8-bit integer | Missing Packets |
| wtp.header.sequence | Packet Sequence Number | Unsigned 8-bit integer | Packet Sequence Number |
| wtp.header.version | Version | Unsigned 8-bit integer | Version |
| wtp.header_data | Data | Byte array | Data |
| wtp.header_variable_part | Header: Variable part | Byte array | Variable part of the header |
| wtp.inv.reserved | Reserved | Unsigned 8-bit integer | Reserved |
| wtp.inv.transaction_class | Transaction Class | Unsigned 8-bit integer | Transaction Class |
| wtp.pdu_type | PDU Type | Unsigned 8-bit integer | PDU Type |
| wtp.sub_pdu_size | Sub PDU size | Byte array | Size of Sub-PDU |
| wtp.tpi | TPI | Unsigned 8-bit integer | Identification of the Transport Information Item |
| wtp.tpi.info | Information | No value | The information being send by this TPI |
| wtp.tpi.opt | Option | Unsigned 8-bit integer | The given option for this TPI |
| wtp.tpi.opt.val | Option Value | No value | The value that is supplied with this option |
| wtp.tpi.psn | Packet sequence number | Unsigned 8-bit integer | Sequence number of this packet |
| wtp.trailer_flags | Trailer Flags | Unsigned 8-bit integer | Trailer Flags |