Diameter Interfaces

Home / Resources / Diameter Interfaces

Diameter signaling is widely used in telecommunication network architecture developed by various telecommunications associations like 3GPP LTE, ETSI TISPAN, ITU, 3GPP2 and may other. Diameter base protocol supports reliable transport, transmission security, failover mechanism, state machine, capability negotiation, dynamic peer discovery and scalability. Diameter Applications extend the base protocol by adding new commands and/or attributes. GTP-C v2 protocol is also used for mobility and connectivity purpose.

Interface is a logical reference point to refer communication between two network elements. List of Diameter interfaces is described in following section.

3GPP, ETSI and IETF Diameter Interfaces

Interface Application Id Description Specification
Cx interface16777216 Between CSCF and HSS, Subscription and Authentication Data – IMS 3GPP TS 29.228, TS 29.229
Dh interface16777217 Between AS and SLF 3GPP TS 29.328, TS 29.329
Dw interface Between the 3GPP AAA Server and an SLF 3GPP TS 29.234
Dx interface16777216 Between CSCF and SLF 3GPP TS 29.228, TS 29.229
Dz interface16777221 Between BSF and SLF 3GPP TS 29.109, TS 33.220
Gi interface Between Packet Domain and an external packet data network 3GPP TS 29.061
Gmb interface16777223 Between GGSN and BM-SC 3GPP TS 29.061
Gq interface16777222 Between AF and PDF 3GPP TS 29.209
Gx interface16777224/25/38 Between PCEF and the PCRF, QoS and Policy 3GPP TS 29.212, TS 23.203
Gxa interface16777266 Between PCRF and the BBERF 3GPP TS 23.203
Gxb interface16777266 Between ePDG and vPCRF 3GPP TS 23.203
Gxc interface16777266 Between BPCRF and the BBERF 3GPP TS 23.203
Gy interface4 Between OCS and PCEF, online charging 3GPP TS 32.299, TS 32.251
Gz interface3 Between PCEF and OFCS 3GPP TS 32.240, TS 32.295
H2 interface Between the 3GPP AAA Server and the HA 3GPP TS 23.402
Mz interface Mz is the roaming variant of the Gmb interface 3GPP TS 29.061
Np interface16777342 Between RCAF (RAN Congestion Awareness Function) and PCRF 3GPP TS 29.217
Ns interface16777347 Between RCAF and SCEF, network status 3GPP TS 29.153
Nt interface16777348 Between PCRF and SCEF (Service Capability Exposer Functionality) 3GPP TS 29.154
Pr interface16777230 Between the 3GPP AAA Server and the PNA 3GPP TS 29.234
Re interface16777218/53 Between OCF and Rating function 3GPP TS 32.296
Rf interface Between AS and OFCS, postpaid charging 3GPP TS 32.299, TS 32.260
Ro interface3 Between AS and OCS, online charging in IMS & LTE 3GPP TS 32.299, TS 32.260
Rx interface16777229/36 Between AF and the PCRF, QoS and Policy 3GPP TS 29.214, TS 23.203
S13, S13' interface16777252 Between EIR and MME/SGSN 3GPP TS 29.272
S6a interface16777251 Between MME and HSS, Subscription and Authentication Data 3GPP TS 29.272
S6b interface16777272 Between the 3GPP AAA Server/Proxy and the PDN GW 3GPP TS 23.402
S6d interface16777251 Between SGSN and HSS, Subscription and Authentication Data 3GPP TS 29.272
S7a interface16777308 Between MME and CSS 3GPP TS 29.272
S7d interface16777308 Between SGSN and CSS 3GPP TS 29.272
S7c interface Transfer of (QoS) policy information from PCRF to the S-GW 3GPP TS 32.820, TS 23.402
S9 interface16777267 Between PCRF in the HPLMN (H-PCRF) and a PCRF in the VPLMN (V-PCRF) 3GPP TS 23.203, TS 29.215
Sd interface16777303 Between PCRF and TDF 3GPP TS 29.212
SGi interface Between the EPC based PLMN and the packet data network 3GPP TS 29.061
Sh interface16777217 Between AS and HSS, Subscription and Authentication Data – IMS 3GPP TS 29.328, TS 29.329
Sp interface Between PCRF and SPR 3GPP TS 29.328, TS 23.203
St interface16777349 Between PCRF and TSSF (Traffic Steering Support Function) 3GPP TS 29.212
Sta interface16777250 Between a trusted non-3GPP IP access and the 3GPP AAA Server/Proxy 3GPP TS 23.402
SWa interface Between an un-trusted non-3GPP IP access and the 3GPP AAA Server/Proxy 3GPP TS 23.402
SWd interface Between the 3GPP AAA Proxy and 3GPP AAA Server 3GPP TS 23.402
SWm interface16777264 Between the 3GPP AAA Server/Proxy and the ePDG 3GPP TS 23.402
SWn interface Between Untrusted Non-3GPP IP Access and ePDG 3GPP TS 23.402
SWx interface16777265 Between the 3GPP AAA Server and the HSS 3GPP TS 23.402
Sy interface16777302/04 Between PCRF and OCS/OFCS 3GPP TS 29.219
V4 interface16777355 Between V2X Control Function and HSS 3GPP TS 29.388
V6 interface16777356 Between Inter-V2X Control Function 3GPP TS 29.389
Wa interface5 Between the WLAN AN and the 3GPP AAA Proxy 3GPP TS 29.234
Wd interface1, 5 Between the 3GPP AAA Proxy and 3GPP AAA Server 3GPP TS 29.234
Wg interface1, 5 Between the 3GPP AAA Server/Proxy and the WAG 3GPP TS 29.234
Wm interface1, 5 Between the 3GPP AAA Server and the PDG 3GPP TS 29.234
Wx interface16777219 Between the 3GPP AAA Server and the HSS 3GPP TS 29.234
Zh interface16777221 Between BSF and HSS 3GPP TS 29.109, TS 33.220
Zn, Zn' interface16777220/68 Between BSF and NAF 3GPP TS 29.109, TS 33.220