OpenBSC implements several MSC components, including the A-bis protocol (the protocol between the BTS and the BSC), AUC, HLR, VLR (both using SQL tables), and a SMS Switching Center. OpenBSC can be accessed using telnet.

openbsc-master
..............\.gitignore
..............\.gitreview
..............\contrib
..............\.......\jenkins.sh
..............\debian
..............\......\autoreconf
..............\......\changelog
..............\......\compat
..............\......\control
..............\......\copyright
..............\......\docs
..............\......\osmo-gtphub.default
..............\......\osmo-gtphub.examples
..............\......\osmo-gtphub.init
..............\......\osmo-gtphub.install
..............\......\osmocom-bs11-utils.install
..............\......\osmocom-bsc-nat.init
..............\......\osmocom-bsc-nat.install
..............\......\osmocom-bsc.examples
..............\......\osmocom-bsc.install
..............\......\osmocom-gbproxy.init
..............\......\osmocom-gbproxy.install
..............\......\osmocom-ipaccess-utils.install
..............\......\osmocom-nitb.default
..............\......\osmocom-nitb.dirs
..............\......\osmocom-nitb.examples
..............\......\osmocom-nitb.init
..............\......\osmocom-nitb.install
..............\......\osmocom-sgsn.default
..............\......\osmocom-sgsn.examples
..............\......\osmocom-sgsn.init
..............\......\osmocom-sgsn.install
..............\......\rules
..............\......\source
..............\......\......\format
..............\openbsc
..............\.......\.gitignore
..............\.......\AUTHORS
..............\.......\COPYING
..............\.......\Makefile.am
..............\.......\README
..............\.......\README.vty-tests
..............\.......\configure.ac
..............\.......\contrib
..............\.......\.......\a-link
..............\.......\.......\......\sccp-split-by-con.lua
..............\.......\.......\bsc-test
..............\.......\.......\........\README
..............\.......\.......\........\all_dial
..............\.......\.......\........\dial.sh
..............\.......\.......\........\drop-oml.sh
..............\.......\.......\........\drop.sh
..............\.......\.......\........\hangup
..............\.......\.......\........\msc.sh
..............\.......\.......\bsc_control.py
..............\.......\.......\bt.py
..............\.......\.......\convert_to_enum.py
..............\.......\.......\gprs
..............\.......\.......\....\gb-proxy-unblock-bug.py
..............\.......\.......\....\gprs-bssgp-histogram.lua
..............\.......\.......\....\gprs-buffer-count.lua
..............\.......\.......\....\gprs-split-trace-by-tlli.lua
..............\.......\.......\....\gprs-verify-nu.lua
..............\.......\.......\hlr-remove-old.sql
..............\.......\.......\hlrsync
..............\.......\.......\.......\hlrsync.py
..............\.......\.......\mgcp_server.py
..............\.......\.......\nat
..............\.......\.......\...\test_regexp.c
..............\.......\.......\...\ussd_example.py
..............\.......\.......\rtp
..............\.......\.......\...\gen_rtp_header.erl
..............\.......\.......\...\rtp_replay.st
..............\.......\.......\...\rtp_replay_shared.st
..............\.......\.......\...\rtp_replay_sip.st
..............\.......\.......\...\timestamp_rtp.lua
..............\.......\.......\sms
..............\.......\.......\...\fill-hlr.st
..............\.......\.......\...\hlr-query.st
..............\.......\.......\...\sqlite-probe.tap.d
..............\.......\.......\systemd
..............\.......\.......\.......\osmo-bsc-mgcp.service
..............\.......\.......\.......\osmo-bsc.service
..............\.......\.......\.......\osmo-nitb.service
..............\.......\.......\.......\osmo-sgsn.service
..............\.......\.......\testconv
..............\.......\.......\........\Makefile
..............\.......\.......\........\testconv_main.c
..............\.......\doc
..............\.......\...\BS11-OML.txt
..............\.......\...\Makefile.am
..............\.......\...\call-routing.txt
..............\.......\...\channel_release.txt
..............\.......\...\control-interface.txt
..............\.......\...\e1-data-model.txt
..............

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