List of TCP/UDP Port numbers
Below is a list of TCP/UDP port numbers as it is used by Osmocom GSM related software.
| L4 | Port Number | Purpose | Software |
| TCP | 2775 | SMPP | osmo-nitb |
| TCP | 3002 | A-bis/IP OML | osmo-bts,osmo-bsc, osmo-nitb |
| TCP | 3003 | A-bis/IP RSL | osmo-bts,osmo-bsc, osmo-nitb |
| TCP | 4240 | telnet (VTY) | osmo-pcu, osmo_pcap_client |
| TCP | 4241 | telnet (VTY) | osmo-bts, osmo_pcap_server |
| TCP | 4242 | telnet (VTY) | osmo-nitb/osmo-bsc/cellmgr_ng |
| TCP | 4243 | telnet (VTY) | osmo-bsc_mgcp? |
| TCP | 4244 | telnet (VTY) | osmo-bsc_nat |
| TCP | 4245 | telnet (VTY) | osmo-sgsn |
| TCP | 4246 | telnet (VTY) | osmo-gbproxy |
| TCP | 4247 | telnet (VTY) | osmocomBB |
| TCP | 4249 | Control Interface | osmo-nitb/osmo-bsc |
| TCP | 4250 | Control Interface | osmo-bsc_nat |
| TCP | 5000 | A/IP | osmo-bsc_nat |
| UDP | 2427 | MGCP GW | osmo-bsc_mgcp? |
| UDP | 4729 | GSMTAP | Almost every osmocom project |
| UDP | 23000 | NS-over-IP | osmo-sgsn,osmo-pcu |
