| A | Interface between an MSC and a BSC | show |
| Abis | BTS - BSC (Abis is a proprietary interface) | show |
| Ater | BSC(SMUX) - TC(SMUX) (Ater is a proprietary interface) | show |
| Ater' | SMUX - TC (Ater-prime is a proprietary interface) | show |
| B | MSC - VLR (MSC/VLR internal interface) | show |
| Bc | Reference point for the CDR file transfer from the Circuit Switched CGF to the BD | |
| Bi | Reference point for the CDR file transfer from the IMS CGF to the BD | |
| Bl | Reference point for the CDR file transfer from the GMLC CGF to the BD | |
| Bm | Reference point for the CDR file transfer from the MMS CGF to the BD | |
| Bo | Reference point for the CDR file transfer from the OCF CGF to the BD | |
| Bp | Reference point for the CDR file transfer from the Packet Switched CGF to the BD | |
| Bs | Reference point for the CDR file transfer for CAMEL services to the BD, i.e. from the SCF CGF to the | |
| Bt | Reference point for the CDR file transfer from the PoC CGF to the BD | |
| Bw | Reference point for the CDR file transfer from the WLAN CGF to the BD | |
| Bx | Reference point for CDR file transfer between any (generic) 3G domain, subsystem or service CGF and | |
| C | Interface between a HLR and a SMSC | show |
| CAP | Reference point for CAMEL between a network element with integrated SSF and the OCS | |
| CIMD2 | Interface between SMSC and USSDC | show |
| Cr | Reference Point between an AS and an MRFC | |
| Cx | Reference Point between a CSCF and an HSS | show |
| D | Interface between a MSC and a HLR | |
| Dh | Interface between SLF and AS | show |
| Dw | Interface between SLF and AAA | show |
| Dx | Reference Point between an ICSCF and an SLF | show |
| E | Interface between a MSC and a SMSC | show |
| F | Interface between MSC and EIR | show |
| G | Interface between VLRs | show |
| Ga | Reference point between a CDF and the CGF for CDR transfer | show |
| Gb | Interface between an SGSN and a BSC | show |
| Gc | Interface between an GGSN and an HLR | show |
| Gd | Interface between an SMS-GMSC and an SGSN, and between a SMS-IWMSC and an SGSN | show |
| Ge | Interface between a SGSN and a CAMEL GSM SCF (gprsSSF – gsmSCF) | show |
| Gf | Interface between an SGSN and an EIR | show |
| Gi | Reference point between GPRS and an external packet data network | show |
| GLa | Interface between the HLR and the GLR | |
| GLb | Interface between the VLR and the GLR | |
| GLc | Interface between the SGSN and the GLR | |
| GLd | Interface between the GLR and the IM_MSC | |
| GLe | Interface between the GLR and the IM_GSN | |
| GLf | Interface between the SMS-GMSC and the GLR | |
| GLg | Interface between the SMS-GMSC and the IM_MSC | |
| GLh | Interface between the MSC and the IM_MSC | |
| GLi | Interface between the GMLC and the IM_MSC | |
| GLj | Interface between the GGSN and the IM_GSN | |
| GLk | Interface between the SGSN and the IM_GSN | |
| Gm | Reference Point between a UE and a PCSCF | |
| Gn | Interface between two GSNs within the same PLMN | show |
| Gp | Interface between two GSNs in different PLMNs | show |
| Gq | Interface between PDF and AF | show |
| Gr | Interface between an SGSN and an HLR | show |
| Gs | Interface between an SGSN and an MSC/VLR | show |
| Gx | Reference point between a PCRF and a PCEF | show |
| Gxa | PCRF - Trusted non-3GPP access | show |
| Gxc | Interface between PCRF and S-GW | show |
| Gxx | Interface between PCRF and BBERF | show |
| Gy | Online charging reference point between a PCEF and an OCS | show |
| Gz | Offline charging reference point between a PCEF and a CGF | show |
| H | Interface between HLR and AuC | show |
| Ici | Reference Point between an IBCF and another IBCF belonging to a different IM CN subsystem network | |
| ISC | Reference Point between a CSCF and an Application Server and between a CSCF and an MRB | show |
| Iu | Interface between the RNS and the core network | |
| Iub | Interface between NodeB and RNC | show |
| Iubc | Interface between RNC and CBC | show |
| IuCS | Interface between RNC and MSC | show |
| Iuh | Logical interface between HNB and HNB-GW | show |
| Iupc | Interface between RNC and SAS | show |
| IuPS | Interface between RNC and SGSN | show |
| Iur | Interface between RNCs | show |
| Iur-g | Interface between RNS and BSS | show |
| Ix | Reference Point between IBCF and TrGW | |
| Izi | Reference Point between a TrGW and another TrGW belonging to a different IM CN subsystem network | |
| Lb | Interface between BSC and SMLC | show |
| Lc | Interface between GMLC and gsmSCF | show |
| Le | Reference Point between an AS and a GMLC | show |
| Lg | Interface between GMLC - MSC and GMLC - SGSN | show |
| Lh | Interface between GMLC and HLR | show |
| Lp | Interface between SMLCs | show |
| Lr | Interface between Gateway MLCs | show |
| Ma | Reference Point between an AS and an ICSCF | show |
| Mb | GGSN - IMS (Reference point to IPv6 services) | show |
| Mc | Interface between the MGW and (G)MSC server | show |
| Mg | Reference Point between an MGCF and a CSCF | show |
| Mi | Reference Point between a CSCF and a BGCF | show |
| Mj | Reference Point between a BGCF and an MGCF | show |
| Mk | Reference Point between a BGCF/IMS ALG and another BGCF | show |
| Mm | Reference Point between a CSCF/BGCF/IMS ALG and an IP multimedia network | show |
| MM1 | Interface between WAP-GW and MMSC | show |
| MM3 | Interface between MMSC | show |
| MM4 | Interface between own MMSC and foreign MMSC | show |
| MM5 | Interface between MMSC and HSS resp. HLR | show |
| MM6 | Interface between MMSC and MMS DB | show |
| MM7 | Interface between MMSC and Internet | show |
| Mn | Interface between MGCF and IMS-MGW | show |
| Mp | Interface between MRFC | show |
| Mr | Reference Point between an CSCF and an MRFC | show |
| Mw | Reference Point between a CSCF and another CSCF | show |
| Mx | Reference Point between a CSCF/BGCF and IBCF | show |
| Nb | Interface between CS-MGW | show |
| Nc | Interface between MSS and GMSS | show |
| PSTN | Public Switched Telephony Network | show |
| R | Reference point between a non-ISDN compatible TE and MT | |
| R1 | Interface between MS and BS | show |
| R3 | Interface between ASN and CSN | show |
| R4 | Interface between ASN | show |
| R5 | Interface between CSN | show |
| R6 | Interface between BS and ASN | show |
| R8 | interface between BS | show |
| Rc | Reference Point between an AS and an MRB | |
| Re | Online Charging Reference Point towards the Rating Function | |
| Rf | Offline Charging Reference Point between a PCN network element and CDF | |
| Rg | Reference Point between Applications and the GUP Server | |
| Ro | Online charging reference point between a 3G network element and the OCS | |
| Rp | Reference Point between the GUP Server and GUP Data Repositories, and between Applications and GUP D | |
| Rr | Online Charging Reference Point towards an external account recharging server | |
| Rx | Reference point between the PCRF and an AF | show |
| S1 | Interface between eNodeB and S-GW (user plane) and eNodeB and MME (control plane) | show |
| S10 | Interface between MME | show |
| S11 | Interface between MME and S-GW | show |
| S12 | Interface between RNC and S-GW | show |
| S13 | Interface between MME and EIR | show |
| S16 | Source SGSN to target SGSN for PS HO | show |
| S2 | Interface to none3 GPP infrastructure | |
| S2a | P-GW - Trusted Non-3GPP IP Access (Roaming Case EPC) | show |
| S2b | P-GW - ePDG (to Untrusted Non-3GPP IP Access, Roaming Case EPC) | show |
| S2c | P-GW - other UE (Roaming Case EPC) | show |
| S3 | Interface between MME and SGSN | show |
| S4 | Interface between S-GW and SGSN | show |
| S5 | Interface between S-GW and P-GW | show |
| S6a | Interface between MME and HSS | show |
| S6b | Interface between P-PW and AAA | show |
| S7 | Interface between P-GW and PCRF | |
| S8 | Interface between MME and P-GW (Roaming Case EPC) | show |
| S9 | Interface between H-PCRF and V-PCRF (Roaming Case EPC) | show |
| SBc | Interface between MME and CBC | show |
| SCF | Interface between HSS and gsmSCF | show |
| SGi | Interface between P-GW and OPDN | show |
| SGs | Interface between MSS and MME | show |
| Sh | Reference Point between an AS (SIPAS or OSACSCF) and an HSS | show |
| Si | Reference Point between an IM-SSF and an HSS | show |
| Sp | Reference point bteween SPR and PCRF | |
| SS7 | Interface between networks | show |
| STa | AAA - Trusted non-3GPP IP Access | show |
| Sv | Interface between MME to MSS/MSC and SGSN to MSC | show |
| SWa | Interface between AAA and Untrusted non-3GPP IP Access | show |
| SWd | Interface between AAA | show |
| SWm | Interface between AAA and ePDG | show |
| SWn | Interface between ePDG and Untrusted non-3GPP IP Access | show |
| SWu | Interface between UE and ePDG | show |
| SWx | Interface between AAA and HSS | show |
| Sy | Interface between PCRF and OCS | |
| Um | Interface between the Mobile Station (MS) and the GSM fixed network part | show |
| Ut | Reference Point between UE and an Application Server | show |
| Uu | Interface between the Mobile Station (MS) and the UMTSfixed network part | show |
| Wa | Reference point between a WLAN and a 3GPP AAA Server/Proxy (control signalling) | show |
| Wd | Reference point between a 3GPP AAA Server and 3GPP AAA Proxy (control signalling) | show |
| Wf | Offline charging reference point between a 3GPP WLAN CTF and the CDF | |
| Wg | Interface between AAA, AAAp and WAG | show |
| Wi | Interface between PDG and PDN | show |
| Wm | Interface between AAA and PDG | show |
| Wn | Interface between WLAN AN and WAG | show |
| Wo | Online charging reference point between a 3GPP WLAN CTF and the OCS | show |
| Wp | Interface between WAG and PDG | show |
| Wu | Reference point between a WLAN UE and a PDG | show |
| Ww | Interface between UE and WLAN AN | show |
| Wx | Interface between AAA and HSS | show |
| X2 | Interface between eNodeB | show |
Looking for: