This tool is a simple table presenting a list of interfaces used in networks based on the DIAMETER protocol. Next to each interface is a short description of what each interface is used for, and which version of the specification is supported by it. Diameter Interfaces connect between different network elements in Diameter protocol based mobile communication networks, such as 4G LTE networks. In the following table, you will find a list of interfaces and the network elements used to connect.
| Interface | Network location | Supported version |
|---|---|---|
| Diameter Base Protocol | IETF RFC 3588, 4960, 793 | |
| Diameter Commands for 3GPP | IETF RFC 3589 | |
| Diameter Credit Control App | IETF RFC 4006 | |
| NASREQ Support for Network Access Server | IETF RFC 4005 | |
| EAP Support for Extensible Authentication Protocol | IETF RFC 4072 | |
| Mobile IPv4 Support for Diameter Mobile IPv4 | IETF RFC 4004 | |
| Diameter Mobile IPv6 | IETF RFC 5447 | |
| Diameter SIP Application | IETF RFC 4740 | |
| Sh interface | Between AS and HSS, Subscription and Authentication Data – IMS | 3GPP TS 29.328 & TS 29.329 |
| Sd interface | Between PCRF and TDF (Traffic Detection Function) | 3GPP TS 29.212 |
| Sy interface | Between PCRF and OCS/OFCS, Policy and Charging Control over Sy reference point | 3GPP TS 29.219 |
| Dh interface | Between AS and SLF | 3GPP TS 29.328 & TS 29.329 |
| Rf interface | Between AS and OFCS, postpaid charging | RFC 4006, 3GPP TS 32.225 & TS 32.299 |
| Ro interface | Between AS and OCS, online charging in IMS & LTE | RFC 4006, 3GPP TS 32.225 & TS 32.299 |
| Re interface | Between OCF and Rating function | 3GPP TS 32.296 |
| Cx interface | Between CSCF and HSS, Subscription and Authentication Data – IMS | 3GPP TS 29.228 & TS29.229 |
| Dx interface | Between CSCF and SLF | 3GPP TS 29.228 & TS29.229 |
| Sp interface | Between PCRF and SPR | 3GPP TS 23.203, TS 29.328 & TS 29.329 |
| Rx interface | Between AF and the PCRF, QoS and Policy | 3GPP TS 23.203 & TS 29.214 |
| Gx interface | Between PCEF and the PCRF, QoS and Policy | 3GPP TS 29.212 & TS 23.203 |
| Gy interface | Between OCS and PCEF, online charging | 3GPP TS 32.299, TS 32.251 & RFC 4006 |
| Gz interface | Between PCEF and OFCS | 3GPP TS 32.240, TS 32.295 |
| Gq interface | Between AF and PDF | 3GPP TS 29.209 |
| Gi interface | Between Packet Domain and an external packet data network | 3GPP TS 29.061 |
| SGi interface | Between the EPC based PLMN and the packet data network | 3GPP TS 29.061 |
| Zh interface | Between BSF and HSS | 3GPP TS 29.109 & TS 33.220 |
| Zh interface | Between BSF and HSS (used between operators) | 3GPP TS 29.109 & TS 33.220 |
| Dz interface | Between BSF and SLF | 3GPP TS 29.109 & TS 33.220 |
| Zn interface | Between BSF and NAF | 3GPP TS 29.109 & TS 33.220 |
| Zn’ interface | Between BSF and Zn Proxy | 3GPP TS 29.109 & TS 33.220 |
| Dw interface | Between the 3GPP AAA Server and an SLF | 3GPP TS 29.234 |
| Wa interface | Between the WLAN AN and the 3GPP AAA Proxy | 3GPP TS 29.234 |
| Wd interface | Between the 3GPP AAA Proxy and 3GPP AAA Server | 3GPP TS 29.234 |
| Wx interface | Between the 3GPP AAA Server and the HSS | 3GPP TS 29.234 |
| Wm interface | Between the 3GPP AAA Server and the PDG | 3GPP TS 29.234 |
| Wg interface | Between the 3GPP AAA Server/Proxy and the WAG | 3GPP TS 29.234 |
| Pr interface | Between the 3GPP AAA Server and the PNA | 3GPP TS 29.234 |
| Wm interface | Between the 3GPP AAA Server and the PDG | 3GPP TS 29.234 |
| Gmb interface | Between GGSN and BM-SC | 3GPP TS 29.061 |
| Mz interface | Mz is the roaming variant of the Gmb reference point with the same functionality | 3GPP TS 29.061 |
| Bi interface | CCF to BS | 3GPP TS TS 32.225 |
| MM10 interface | Multimedia Messaging Service (MMS) | OMA MM10 interface |
| Ty interface | Between AGW and PCRF | 3GPP2 TSG-X X.S0013-014 |
| Tx interface | Between AF and PCRF | 3GPP2 TSG-X X.S0013-013 |
| S6a interface | Between MME and HSS, Subscription and Authentication Data | 3GPP TS 29.272 |
| S6b interface | Between the 3GPP AAA Server/Proxy and the PDN GW | 3GPP TS 23402 |
| S6d interface | Between SGSN and HSS, Subscription and Authentication Data | 3GPP TS 29.272 |
| S7c interface | Transfer of (QoS) policy information from PCRF to the S-GW. | 3GPP TS 32820, TS 23402 |
| S9 interface | Between PCRF in the HPLMN (H PCRF) and a PCRF in the VPLMN (V PCRF) | 3GPP TS 23.203 & TS 29.215 |
| S13 and S13′ interface | Between EIR and MME/SGSN | 3GPP TS 29.272 |
| Gxa interface | PCRF and the BBERF | 3GPP TS 23.203 |
| Gxb interface | Between ePDG and vPCRF | 3GPP TS 23.203 |
| Gxc interface | BPCRF and the BBERF | 3GPP TS 23.203 |
| SWa interface | Between an un-trusted non-3GPP IP access and the 3GPP AAA Server/Proxy | 3GPP TS 23402 |
| SWd interface | Between the 3GPP AAA Proxy and 3GPP AAA Server | 3GPP TS 23402 |
| SWn interface | Between Untrusted Non-3GPP IP Access and ePDG | 3GPP TS 23402 |
| SWm interface | Between the 3GPP AAA Server/Proxy and the ePDG | 3GPP TS 23402 |
| SWx interface | Between the 3GPP AAA Server and the HSS | 3GPP TS 23402 |
| Sta interface | Between a trusted non-3GPP IP access and the 3GPP AAA Server/Proxy | 3GPP TS 23402 |
| H2 interface | Between the 3GPP AAA Server and the HA | 3GPP TS 23402 |
| Gq’ interface | Between AF and RACS | ETSI TS 183.017 |
| E2 interface | Between AF and NASS | ETSI TS 283 035 |
| E4 interface | Between NASS and RACS | ETSI TS 283 034 |
| E5 interface | Between UAAF – UAAF | ETSI TS 282 004 |
| Re interface | Between RCEF and RACS | ETSI TS 183 060 |
| A3 interface | Between UAAF and AMF | ETSI TS 282 004 |
| A4 interface | Between CLF and UAAF | ETSI TS 282 004 |
| Rr interface | x-RACF | 03196-NGN-R3 |
| Zh interface | Generic Authentication Architecture (GAA) | PKT-SP-29.109 |
| Zn interface | Generic Authentication Architecture (GAA) | PKT-SP-29.109 |
| Cx interface | CSCF- HSS | PKT-SP-29.229 |
| Dx interface | CSCF- SLF | PKT-SP-29.229 |
| Pkt-laes-2 interface | Session Control Element — DF (electronic surveillance requirements) | PKT-SP-ES-INF-I01 |
| P-CSCF- PAM Interface | Between P-CSCF – PAM | PKT-SP-QOS-I02-080425, 3GPP TS 23.203 & TS 29.214 |
| Pkt-mm-2 interface | Policy Server — CMTS | 3GPP TS 29.212 & TS 23.203 |
| TC-6 | Based on 3GPP Rx | MSF-IA-DIAMETER.010-FINAL |
| TC-7 | Based on 3GPP Ty | MSF-IA-DIAMETER.014-FINAL |
| TC-8 | Based on 3GPP Tx | MSF-IA-DIAMETER.013-FINAL |
| TC-9 | Based on 3GPP Rq | MSF-IA-DIAMETER.005-FINAL |
| TC-10 | Based on 3GPP Gx | MSF-IA-DIAMETER.012-FINAL |
| TC-11 | Based on 3GPP e4 | MSF-OA-DIMATER.011-FINAL |
| DB-0 | Based on 3GPP Cx/Dx | MSF-IA-DIAMETER.006-FINAL |
| DB-2 | Based on 3GPP Sh/Dh | MSF-IA-DIAMETER.003-FINAL |
| BI-1 | Based on 3GPP Rf | MSF-IA-BILLING.001-FINAL |
| LOC-1 | Based on 3GPP e2 | MSF-IA.DIAMETER.008-FINAL |
| Rw interface | Between the Policy Decision Physical Entity (PD-PE) and the Policy Enforcement Physical Entity (PE-PE) | ITU Q.3303.3 |
| Rs interface | Between Service Control Physical Entity (SC-PE) and Resource and Admission Control Physical Entity (RAC-PE) | ITU Q.3301 |