A comprehensive list of telecom interfaces depending upon the type of Node
Core Network-CS domain
| Node-1 | Node-2 | Interface | ||
| MSC-Server | VLR | B | ||
| MSC-Server | HLR | C | ||
| HLR | VLR | D | ||
| MSC-Server | MSC-server | E | ||
| MSC-Server | IP-SM-GW | E | ||
| MSC-Server | EIR | F | ||
| VLR | VLR | G | ||
| HLR/HSS | AuC | H | ||
| GMSC-Server | CS-MGW | Mc | ||
| GMSC-Server | MSC-Server | Nc | ||
| CS-MGW | CS-MGW | Nb |
Core Network – PS domain
| Node-1 | Node-2 | Interface | ||
| SGSN | HLR | Gr | ||
| GGSN | HLR | Gc | ||
| SGSN | EIR | Gf | ||
| SGSN | GGSN(same-plmn) | Gn | ||
| SGSN | GGSN(diff-plmn) | Gp |
Interface between CS and PS domains
| Node-1 | Node-2 | Interface | ||
| MSC/VLR | GGSN | Gs | ||
| SGSN/IP-SM-GW | SMS/GMSC | Gd | ||
| MSC/VLR | MME | SGs | ||
| MSC | MME/SGSN | Sv |
Interfaces in EPC
| Node-1 | Node-2 | Interface | ||
| MME | HSS | S6a | ||
| SGSN | HSS | S6d | ||
| MME | S-GW | S11 | ||
| MME | MME | S10 | ||
| S-GW | PDN-GW | S5/S8 | ||
| MME | EIR | S3 | ||
| S-GW | SGSN | S4 | ||
| S-GW | UTRAN | S12 | ||
| NON-3GPP IP Access | SGW/PGW | S2a | ||
| PDN-GW/S-GW | ePDG | S2b | ||
| PDN-GW | Ue | S2c | ||
| PDN-GW | 3GPP AAA Server/proxy | S6b | ||
| Untrusted non-3GPP IP Access | 3GPP AAA Server/proxy | SWa | ||
| Trusted non-3GPP IP Access | 3GPP AAA Server/proxy | STa | ||
| 3GPP AAA Server | 3GPP AAA proxy | SWd | ||
| ePDG | 3GPP AAA Server/proxy | SWm | ||
| ePDG | Untrusted non-3GPP Access | SWn | ||
| ePDG | UE | SWu | ||
| HSS | 3GPP AAA Server | SWx | ||
| UE | ANDSF | S14 | ||
| HRDP AN | MME | S101 | ||
| 3GPP2 1xCS IWS | MME | S102 | ||
| HSGW | S-GW | S103 | ||
| UE | CSG List Server | Uh |
RAN
| Node-1 | Node-2 | Interface | ||
| BSC | BTS | Abis | ||
| RNC | RNC | IuR | ||
| RNC | nodeb | Iub | ||
| HNB | HNB-GW | Iu-h | ||
| eNodeB | eNodeB | X2 |