Modules

Here is a list of all modules:

GSM A5 ciphering algorithm	Osmocom GSM ciphering algorithm implementation
A-bis OML	GSM Network Management (OML) messages on the A-bis interface
helpers for GSM
GPRS GEA3/GEA4 ciphering algorithm	Implementation of GPRS Ciphers GEA3 and GEA4
Short Message Service (SMS)
GSM 08.08 / 3GPP TS 48.008 A Interface
Generic Subscriber Update Protocol	The Generic Subscriber Update Protocol (GSUP) is an Osmocom-specific non-standard protocol replacing MAP as the protocol between MSC/VLR/SGSN and HLR in a 3GPP cellular communications network
LAPD implementation common part	Osmocom LAPD core, used for Q.921, LAPDm and others
LAPDm implementation according to GSM TS 04.06
Osmocom Authentication Protocol	The Osmocom Authentication Protocol (OAP) is a way to use the 3GPP AKA (Authentication and Key Agreement) as cryptographic authentication mechanism in other protocols that don't provide cryptographic authentication
A-bis RSL	GSM Radio Signalling Link messages on the A-bis interface
TLV parser	Osmocom TLV Parser
GSM/GPRS/3G Authentication	GSM/GPRS/3G authentication core infrastructure
Crypto
Gsm0408	GSM Mobile Radion Interface L3 messages / TS 04.08
Ipa	IPA Multiplex utility routines