| gtpv1.apn | APN | String | Access Point Name |
| gtpv1.cause | Cause | Unsigned 8-bit integer | Cause of operation |
| gtpv1.chrg_char_f | Flat rate charging | Unsigned 8-bit integer | Flat rate charging |
| gtpv1.chrg_char_h | Hot billing charging | Unsigned 8-bit integer | Hot billing charging |
| gtpv1.chrg_char_n | Normal charging | Unsigned 8-bit integer | Normal charging |
| gtpv1.chrg_char_p | Prepaid charging | Unsigned 8-bit integer | Prepaid charging |
| gtpv1.chrg_char_r | Reserved | Unsigned 8-bit integer | Reserved |
| gtpv1.chrg_char_s | Spare | Unsigned 8-bit integer | Spare |
| gtpv1.chrg_id | Charging ID | Unsigned 32-bit integer | Charging ID |
| gtpv1.chrg_ipv4 | CG address IPv4 | IPv4 address | Charging Gateway address IPv4 |
| gtpv1.chrg_ipv6 | CG address IPv6 | IPv6 address | Charging Gateway address IPv6 |
| gtpv1.ext_id | Extensio Identifier | Unsigned 16-bit integer | Extension Identifier |
| gtpv1.ext_val | Extension Value | String | Extension Value |
| gtpv1.flags | Flags | Unsigned 8-bit integer | Ver/PT/Spare/E/S/PN |
| gtpv1.flags.e | Is Next Extension Header present? | Boolean | Is Next Extension Header present? (1 = yes, 0 = no) |
| gtpv1.flags.payload_type | Protocol type | Unsigned 8-bit integer | Protocol Type (1 = GTP, 0 = GPRS charging protocol : GTP' ) |
| gtpv1.flags.pn | Is N-PDU number present? | Boolean | Is N-PDU number present? (1 = yes, 0 = no) |
| gtpv1.flags.s | Is Sequence Number present? | Boolean | Is Sequence Number present? (1 = yes, 0 = no) |
| gtpv1.flags.spare | Spare bit | Unsigned 8-bit integer | Spare bit (shall be sent as 0) |
| gtpv1.flags.version | Version | Unsigned 8-bit integer | GTP Version |
| gtpv1.gsn_addr_len | GSN Address Length | Unsigned 8-bit integer | GSN Address Length |
| gtpv1.gsn_addr_type | GSN Address Type | Unsigned 8-bit integer | GSN Address Type |
| gtpv1.gsn_ipv4 | GSN address IPv4 | IPv4 address | GSN address IPv4 |
| gtpv1.gsn_ipv6 | GSN address IPv6 | IPv6 address | GSN address IPv6 |
| gtpv1.imsi | IMSI | String | International Mobile Subscriber Identity number |
| gtpv1.lac | LAC | Unsigned 16-bit integer | Location Area Code |
| gtpv1.length | Length | Unsigned 16-bit integer | Length (i.e. number of octets after TID or TEID) |
| gtpv1.map_cause | MAP cause | Unsigned 8-bit integer | MAP cause |
| gtpv1.mcc | MCC | Unsigned 16-bit integer | Mobile Country Code |
| gtpv1.message | Message Type | Unsigned 8-bit integer | GTP Message Type |
| gtpv1.mnc | MNC | Unsigned 8-bit integer | Mobile Network Code |
| gtpv1.ms_reason | MS not reachable reason | Unsigned 8-bit integer | MS not reachable reason |
| gtpv1.ms_valid | MS validated | Boolean | MS validated |
| gtpv1.msisdn | MSISDN | String | MS international PSTN/ISDN number |
| gtpv1.next | Next extension header type | Unsigned 8-bit integer | Next Extension Header Type |
| gtpv1.node_ipv4 | Node address IPv4 | IPv4 address | Recommended node address IPv4 |
| gtpv1.node_ipv6 | Node address IPv6 | IPv6 address | Recommended node address IPv6 |
| gtpv1.npdu_number | N-PDU Number | Unsigned 8-bit integer | N-PDU Number |
| gtpv1.nsapi | NSAPI | Unsigned 8-bit integer | Network layer Service Access Point Identifier |
| gtpv1.pkt_flow_id | Packet Flow ID | Unsigned 8-bit integer | Packet Flow ID |
| gtpv1.ptmsi | P-TMSI | Unsigned 32-bit integer | Packet-Temporary Mobile Subscriber Identity |
| gtpv1.ptmsi_sig | P-TMSI Signature | Unsigned 24-bit integer | P-TMSI Signature |
| gtpv1.qos_al_ret_priority | Allocation/Retention priority | Unsigned 8-bit integer | Allocation/Retention Priority |
| gtpv1.qos_del_err_sdu | Delivery of erroneous SDU | Unsigned 8-bit integer | Delivery of Erroneous SDU |
| gtpv1.qos_del_order | Delivery order | Unsigned 8-bit integer | Delivery Order |
| gtpv1.qos_delay | QoS Delay | Unsigned 8-bit integer | Quality of Service Delay Class |
| gtpv1.qos_guar_dl | Guaranteed bit rate for downlink | Unsigned 8-bit integer | Guaranteed bit rate for downlink |
| gtpv1.qos_guar_ul | Guaranteed bit rate for uplink | Unsigned 8-bit integer | Guaranteed bit rate for uplink |
| gtpv1.qos_max_dl | Maximum bit rate for downlink | Unsigned 8-bit integer | Maximum bit rate for downlink |
| gtpv1.qos_max_sdu_size | Maximum SDU size | Unsigned 8-bit integer | Maximum SDU size |
| gtpv1.qos_max_ul | Maximum bit rate for uplink | Unsigned 8-bit integer | Maximum bit rate for uplink |
| gtpv1.qos_mean | QoS Mean | Unsigned 8-bit integer | Quality of Service Mean Throughput |
| gtpv1.qos_peak | QoS Peak | Unsigned 8-bit integer | Quality of Service Peak Throughput |
| gtpv1.qos_precedence | QoS Precedence | Unsigned 8-bit integer | Quality of Service Precedence Class |
| gtpv1.qos_reliabilty | QoS Reliability | Unsigned 8-bit integer | Quality of Service Reliability Class |
| gtpv1.qos_res_ber | Residual BER | Unsigned 8-bit integer | Residual Bit Error Rate |
| gtpv1.qos_sdu_err_ratio | SDU Error ratio | Unsigned 8-bit integer | SDU Error Ratio |
| gtpv1.qos_spare1 | Spare | Unsigned 8-bit integer | Spare (shall be sent as '00' ) |
| gtpv1.qos_spare2 | Spare | Unsigned 8-bit integer | Spare (shall be sent as 0) |
| gtpv1.qos_spare3 | Spare | Unsigned 8-bit integer | Spare (shall be sent as '000' ) |
| gtpv1.qos_traf_class | Traffic class | Unsigned 8-bit integer | Traffic Class |
| gtpv1.qos_traf_handl_prio | Traffic handling priority | Unsigned 8-bit integer | Traffic Handling Priority |
| gtpv1.qos_trans_delay | Transfer delay | Unsigned 8-bit integer | Transfer Delay |
| gtpv1.rab_gtp_dn | Downlink GTP-U seq number | Unsigned 16-bit integer | Downlink GTP-U sequence number |
| gtpv1.rab_gtp_up | Uplink GTP-U seq number | Unsigned 16-bit integer | Uplink GTP-U sequence number |
| gtpv1.rab_pdu_dn | Downlink next PDCP-PDU seq number | Unsigned 8-bit integer | Downlink next PDCP-PDU sequence number |
| gtpv1.rab_pdu_up | Uplink next PDCP-PDU seq number | Unsigned 8-bit integer | Uplink next PDCP-PDU sequence number |
| gtpv1.rac | RAC | Unsigned 8-bit integer | Routing Area Code |
| gtpv1.ranap_cause | RANAP cause | Unsigned 8-bit integer | RANAP cause |
| gtpv1.recovery | Recovery | Unsigned 8-bit integer | Restart counter |
| gtpv1.reorder | Reordering required | Boolean | Reordering required |
| gtpv1.rnc_ipv4 | RNC address IPv4 | IPv4 address | Radio Network Controller address IPv4 |
| gtpv1.rnc_ipv6 | RNC address IPv6 | IPv6 address | Radio Network Controller address IPv6 |
| gtpv1.rp | Radio Priority | Unsigned 8-bit integer | Radio Priority for uplink tx |
| gtpv1.rp_nsapi | NSAPI in Radio Priority | Unsigned 8-bit integer | Network layer Service Access Point Identifier in Radio Priority |
| gtpv1.rp_sms | Radio Priority SMS | Unsigned 8-bit integer | Radio Priority for MO SMS |
| gtpv1.rp_spare | Reserved | Unsigned 8-bit integer | Spare bit |
| gtpv1.sel_mode | Selection Mode | Unsigned 8-bit integer | Selection Mode |
| gtpv1.seq_number | Sequence Number | Unsigned 16-bit integer | Sequence Number |
| gtpv1.tear_ind | Teardown indication | Boolean | Teardown Indication |
| gtpv1.teid | TEID | Unsigned 32-bit integer | Tunnel Endpoint Identifier |
| gtpv1.teid_cp | TEID Control Plane | Unsigned 32-bit integer | Tunnel Endpoint Identifier Control Plane |
| gtpv1.teid_data | TEID Data I | Unsigned 32-bit integer | Tunnel Endpoint Identifier Data I |
| gtpv1.teid_ii | TEID Data II | Unsigned 32-bit integer | Tunnel Endpoint Identifier Data II |
| gtpv1.tft_code | TFT operation code | Unsigned 8-bit integer | TFT operation code |
| gtpv1.tft_eval | Evaluation precedence | Unsigned 8-bit integer | Evaluation precedence |
| gtpv1.tft_number | Number of packet filters | Unsigned 8-bit integer | Number of packet filters |
| gtpv1.tft_spare | TFT spare bit | Unsigned 8-bit integer | TFT spare bit |
| gtpv1.tlli | TLLI | Unsigned 32-bit integer | Temporary Logical Link Identity |
| gtpv1.tr_comm | Packet transfer command | Unsigned 8-bit integer | Packat transfer command |
| gtpv1.trace_ref | Trace reference | Unsigned 16-bit integer | Trace reference |
| gtpv1.trace_type | Trace type | Unsigned 16-bit integer | Trace type |
| gtpv1.unknown | Unknown data (length) | Unsigned 16-bit integer | Unknown data |
| gtpv1.user_addr_pdp_org | PDP type organization | Unsigned 8-bit integer | PDP type organization |
| gtpv1.user_addr_pdp_type | PDP type number | Unsigned 8-bit integer | PDP type |
| gtpv1.user_ipv4 | End user address IPv4 | IPv4 address | End user address IPv4 |
| gtpv1.user_ipv6 | End user address IPv6 | IPv6 address | End user address IPv6 |