| TS 23.040, TS 23.204 | MAP | HLR–GMSC |
| TS 23.228 | TS 29.228, TS 29.229, Diameter | HSS–CSCF; Stateless; 9.3 |
| | MAP | HLR–MSC/VLR |
Dh | TS 29.328 | TS 29.329, Diameter | Equivalent to Sh |
| | RFC 2131, RFC 2132, RFC 1542 | |
| | RFC 1034, RFC 1035, RFC 1123 | |
Dx | TS 23.228 | TS 29.228, TS 29.229, Diameter | Equivalent to Cx |
Dz | TS 33.220 | TS 29.109 | |
| TS 23.040, TS 23.204 | MAP | GMSC–MSC/VLR |
E2 | ES 283.035 | Diameter | |
E4 | ES 283.034 | Diameter | |
| TS 32.240 | TS 32.251, TS 32.295, GTP' | OFCS–PGW/SGW/SGSN/GGSN; CDR: D7.5, 6.4.1, 8.7, 9.3, 9.5, 10.0, 10.5, 11.0., 11.3 |
| | MAP | HLR–GGSN |
| TS 23.040, TS 23.204 | MAP | SMSC–SGSN |
| TS 23.040 | TS 29.338, Diameter | Stateless; IOT/M2M/MTC/SMS |
| | TS 23.078, TCAP, SCCP, M3UA | gsmSCF–SGSN; CAMEL Application Part (CAP) |
| | MAP | EIR–SGSN |
| | TS 29.061 | |
| | GTPv1 | SGSN–GGSN |
Gq/Gq’ | TS 29.209 | Diameter | |
Gp | | GTPv1 | SGSN–GGSN |
| | MAP | HLR–SGSN/MME |
| TS 23.060 | BSSAP+, SCCP, M3UA | VLR–SGSN |
| TS 23.203 | TS 29.212, Diameter | PCRF–PGW/GGSN; Stateful; D8.3, 7.15, 8.4, 8.5, 9.3, 10.12, 11.0 |
| TS 23.203 | TS 29.212, Diameter | PCRF–SGW/AGW; Stateful; D8.3, 8.4, 9.3 |
| TS 32.240 | TS 32.299, DCCA, Diameter | OCS–PGW/CSCF; Stateful/Stateless; 8.9 |
HTTP/JSON | | HTTP, JSON | REST |
| TS 25.410 | TS 25.413 | RNC–SGSN; Iu-IP |
| | MAP | HLR–gsmSCF |
| RFC 4510 | RFC 4511 | Sp/Ud |
| | MAP | GMLC–MSC |
| | MAP | GMLC–HLR |
M1 | TS 36.440 | TS 25.446, SCTP | MBMSGW-eNb; eMBMS/LTE Broadcasting |
| TS 36.440 | TS 36.444, SCTP | MME-eNb; eMBMS/LTE Broadcasting |
MTP3/M2PA | | ITU Q.703-704, RFC 4165, M2PA | SigTran |
| | RFC 7155 | AGW–AAA |
N1 | TS 23.501 | TS 23.502, NAS | UE–AMF; 5GC |
N2 | TS 23.501 | TS 23.502, NGAP | gNodeB–AMF; 5GC |
N3 | TS 23.501 | TS 23.502, GTPv2 | gNodeB–UPF; 5GC |
N4 | TS 23.501 | TS 23.502, PFCP, GTP-U | SMF–UPF; 5GC |
N5g-eir | TS 23.501 | TS 23.502, 5G Service Map | Equipment Identity Register Services; 5GC |
N6 | TS 23.501 | TS 23.502 | UPF–PDN; 5GC |
N9 | TS 23.501 | TS 23.502 | UPF–UPF; 5GC; Roaming |
N26 | TS 23.501 | TS 23.502, TS 23.401, GTPv2 | AMF-MME; EPC-5GC Interworking |
Namf | TS 23.501 | TS 23.502, 5G Service Map | Access and Mobility Management Services; 5GC |
Nausf | TS 23.501 | TS 23.502, 5G Service Map | Authentication Server Services; 15.0, 15.1, 15.2 |
Nbsf | TS 23.501 | TS 23.502, 5G Service Map | Binding Support Management Service; 5GC |
Nchf | TS 23.501 | TS 23.502, 5G Service Map | Charging Service; 5GC |
Nlmf | TS 23.501 | TS 23.502, 5G Service Map | Location Management Services; 5GC |
Nnef | TS 23.501 | TS 23.502, 5G Service Map | Network Exposure Services; 5GC |
Nnrf | TS 23.501 | TS 23.502, 5G Service Map | Network Repository Services; 5GC |
Nnssf | TS 23.501 | TS 23.502, 5G Service Map | Network Slice Selection Services; 5GC |
Nnwdaf | TS 23.501 | TS 23.502, 5G Service Map | Network Data Analytics Services; 5GC |
Np | TS 23.203 | TS 29.217, Diameter | PCRF–RCAF; IOT/M2M/MTC/SMS |
Npcf | TS 23.501 | TS 23.502, 5G Service Map | Policy and Charging Control Service; 5GC |
Nq/Nq’ | | TS 29.405 | MME–RCAF; IOT/M2M/MTC/SMS |
Ns | TS 23.682 | TS 29.153, Diameter | RCAF–SCEF; IOT/M2M/MTC/SMS |
Nsmf | TS 23.501 | TS 23.502, 5G Service Map | Session Management Services; 15.0, 15.1, 15.2 |
Nsmsf | TS 23.501 | TS 23.502, 5G Service Map | SMS Services; 5GC |
| TS 23.203 | TS 29.154, Diameter | PCRF–SCEF; IOT/M2M/MTC/SMS |
| | TS 29.250 | PFDF–SCEF; IOT/M2M/MTC/SMS; REST |
Nudm | TS 23.501 | TS 23.502, 5G Service Map | Unified Data Management Services; 15.0, 15.1, 15.2 |
Nudr | TS 23.501 | TS 23.502, 5G Service Map | Unified Data Repository Services; 5GC |
Nudsf | TS 23.501 | TS 23.502, 5G Service Map | Unstructured Data Storage Function |
OMA Messaging API | OMA-TS-REST_NetAPI_Messaging-V1_0-20151201-C | OMA Specifications | IOT/M2M/MTC/SMS |
OMA Presence API | OMA-TS-REST_NetAPI_Presence-V1_0-20151201-C | OMA Specifications | IOT/M3M/MTC/SMS |
OMA Terminal Status API | OMA-TS-REST_NetAPI_TerminalStatus-V1_0-20131217-A | OMA Specifications | IOT/M4M/MTC/SMS |
Pi*3GPP2 | | X.S0057-A, TS 29.273, Diameter | |
Pi* | | X.S0057-A, Diameter | STa |
| OMA-TS-REST_NetAPI_OneAPIProfile-V4_0-20131224-A | OMA Specifications | |
| TS 32.240 | TS 32.251, TS 32.299, Diameter | OFCS–PGW/CSCF; Stateful/Stateless; 8.9 |
Rq | ES 283.026 | ES 283.026, Diameter | |
| TS 23.203 | TS 29.214, Diameter | PCRF–CSCF; Stateful; D8.3.0, 8.4.0, 9.3, 10.12 |
S101 | TS 23.402 | TS 29.276, GTPv2 | |
| TS 23.401 | TS 36.413, S1AP | eNb–MME |
S1-U | TS 23.401 | GTPv1 | GTPv1-U |
| TS 23.402 | TS 23.852, GTPv2 | AGW–PGW |
| TS 23.402 | TS 23.834, GTPv2 | ePDG–PGW |
S2c | TS 23.402 | | |
| | GTPv2 | MME–SGSN |
| | GTPv2 | SGSN–SGW |
S5 | | GTPv2 | SGW–PGW |
| | TS 29.272, Diameter | HSS–MME/SGSN; Stateless; D8.3, 8.1, 8.6, 9.2, 9.3, 10.5 |
| TS 23.402 | RFC 3748, TS 29.273, Diameter EAP, Diameter | AAA–PGW; Stateless; D9.5, 10.5, 11.3 |
| | TS 29.338, Diameter | HSS–GMSC/IP-SM-GW; Stateless; IOT/M2M/MTC/SMS |
| | TS 29.336, Diameter | HSS–MTC-IWF/MTC-AAA; Stateless; IOT/M2M/MTC/SMS |
| | TS 29.336, Diameter | HSS–SCEF; Stateless; IOT/M2M/MTC/SMS |
S7a/S7d | | TS 29.272, Diameter | CSS–MME/SGSN |
S8 | | GTPv1, GTPv2 | SGW–PGW; GTP-U/GTP-C |
| TS 23.203 | TS 29.212, TS 29.215, Diameter | vPCRF–hPCRF; Stateful; Roaming; D8.3, 8.4, 8.5, 9.3 |
S10 | | GTPv2 | MME–MME; GTPv2-C |
| | GTPv2 | MME–SGW |
S12 | | GTPv1 | RNC–SGW; GTP-U |
| | TS 29.272, Diameter | EIR–MME/SGSN; Stateless; D8.3, 8.6 |
S15 | TS 23.203 | TS 29.212, Diameter | PCRF–HNBGW; Stateful |
| TS 23.203 | TS 29.212, Diameter | TDF–PCRF; Stateful |
| TS 23.040 | TS 29.338, Diameter | MME–SMS-SC; Stateless; IOT/M2M/MTC/SMS |
SGi | | TS 29.061 | PGW–PDN |
| TS 23.040, TS 23.272 | SGsAP, SM-CP | MME–MSC/VLR |
| TS 29.328 | TS 29.329, Diameter | HSS–AS; Stateless |
Si | | MAP | Functionality similar to Diameter Sh; TS 23.278; TS 23.218; TS 29.002 |
| TS 23.271 | TS 29.172, Diameter | MME–GMLC; Stateless |
| TS 23.271 | TS 29.173, Diameter | HSS--GMLC; Stateless |
| TS 23.271 | TS 29.171, SCTP | MME–eSMLC |
| TS 23.246 | GTPv2 | MME–MBMSGW; eMBMS/LTE Broadcasting |
| SMPP50 | | SMS-CS–ESME |
| | W3C SOAP | |
Sp/Ud | TS 23.203 | TS 23.335, TS 29.335 | PCRF–SPR; LDAP |
St | TS 23.203 | TS 29.212, Diameter | PCRF–TSSF; Stateful |
| TS 23.402 | RFC 4072, TS 29.273, Diameter, EAP | AAA–AGW; Stateful; D9.5, 10.5, 11.3 |
Sv | TS 23.216 | TS 29.280, GTPv2 | |
| TS 23.402 | RFC 4072, TS 29.273, Diameter, EAP | AAA–AGW; VoWiFi/VoWLAN; Stateful; D9.5, 10.5, 11.3 |
SWd | TS 23.402 | TS 29.273, Diameter, EAP | VoWiFi/VoWLAN |
| TS 23.402 | RFC 4072, TS 29.273, Diameter, EAP | VoWiFi/VoWLAN; Stateful; D9.5, 10.5, 11.3 |
| TS 23.402 | IKEv2 | VoWiFi/VoWLAN |
| TS 23.402 | TS 29.273, Diameter | VoWiFi/VoWLAN; Stateless; 8.4; |
Sxx | TS 29.244 | PFCP | Control/User Plane Separation (CUPS); Sxa, Sxb, Sxc |
| TS 29.219 | Diameter | PCRF–OCS; Stateful; D11.1;11.0; (Sy’) 0.5.0 |
| TS 23.040 | TS 29.337, Diameter | MTC-IWF–SMC-SC; Stateless; IoT/M2M/MTC |
| TS 29.682 | TS 29.128, Diameter | SCEF–MME/SGSN; Stateless; IoT/M2M/MTC |
| TS 23.040 | TS 29.368, Diameter | SCS–MTC-IWF; Stateless; IoT/M2M/MTC |
Ua | TS 33.220 | TS 24.109 | |
Ub | TS 33.220 | TS 24.109 | |
Wa (Diameter) | TS 23.234 | TS 29.234, EAP, Diameter | Stateful; VoWiFi/VoWLAN |
| TS 23.234 | TS 29.234, EAP, TS 29.061 | VoWiFi/VoWLAN |
Wd (Diameter) | TS 23.234 | TS 29.234, EAP, Diameter | Stateful; VoWiFi/VoWLAN |
Wd (RADIUS) | TS 23.234 | TS 29.234, EAP, TS 29.061 | VoWiFi/VoWLAN |
Wf/Wz | TS 23.234 | TS 29.234, Diameter | Equivalent to Rf/Gz; VoWiFi/VoWLAN |
| TS 23.234 | TS 29.234, Diameter | Stateful; VoWiFi/VoWLAN |
Wm | TS 23.234 | TS 29.234, Diameter | Stateful; VoWiFi/VoWLAN |
Wo/Wy | TS 23.234 | TS 29.234, Diameter | Equivalent to Ro/Gy; VoWiFi/VoWLAN |
| TS 23.234 | TS 29.234, Diameter | Stateless; VoWiFi/VoWLAN; 7.12 |
Zh | TS 33.220 | TS 29.109, Diameter | |
Zn | TS 33.220 | TS 29.109, Diameter | |
BSSAP+ | | TS 29.018 | 7.3 |
DCCA | | RFC 8506, Diameter | RFC 4006 |
Diameter | | RFC 6733, RFC 6737, RFC 5516, SCTP, TCP | |
Diameter EAP | RFC 4072 | EAP-AKA, EAP-AKA', EAP-SIM | |
DTLS | | RFC 6347 (UDP); RFC 6083 (SCTP) | |
| RFC 3748, RFC 5247 | RFC 4187, TS 33.402 | |
EAP-AKA' | RFC 3748, RFC 5247 | RFC 5448, TS 33.402 | |
EAP-SIM | RFC 3748, RFC 5247 | RFC 4186 | |
ESP | | RFC 4835 | |
GTPv1 | | TS 29.060, TS 29.281 | |
GTPv2 | | TS 29.274 | |
| | RFC 2616 | |
HTTP/2 | | RFC 7540 | |
IKEv2 | | RFC 7296, IPSEC, ESP, EAP | |
| | RFC 5406 | |
JSON | | RFC 4627 | |
M2PA | | RFC 4165 | |
M3UA | | RFC 4666 | |
MAP | | TS 29.002, TCAP, SCCP, M3UA | 14.0 |
Milenage | | TS 35.206 | 8.0 |
NAS | TS 38.401 | TS 24.501 | 15.0 |
NGAP | TS 38.401 | TS 38.413 | 15.1, 15.2 |
PFCP | | TS 29.244 | |
RADIUS (3GPP) | | TS 29.061 | |
| Many RFCs | RFC 2865, RFC 2866, RFC 2867, RFC 2868, RFC 3579 | |
RoHC | | RFC 3095 | |
RTP | | RFC 3550 | |
| | TS 23.401 | |
SCCP | | RFC 3868 | |
SCTP | | RFC 4960 | |
SDP | | RFC 4566 | |
| | TS 29.118 | |
| | RFC 3261 | |
SM-CP | TS 23.040 | TS 24.011 | |
TCAP | | RFC 2719 | |
TCP | | RFC 793 | |
TestUSim | | TS 34.108 | 8.0 |
TLS | | RFC 2246 (TLS 1.0), RFC 4346 (TLS 1.1), RFC 5246 (TLS 1.2) | |
TUAK | | TS 35.231 | |
UDP | | RFC 768 | |