|A-Netz phone in a Merceds Benz||B-Netz radio tower in Bredstedt|
|my mother's C-Netz SIM card||NMT (Nordic Mobile Telephone)|
|MTS / IMTS (USA / Canada)||AMPS (USA) / TACS (UK / Ireland / Italy)|
|Eurosignal paging service||The Chaos Computer Club Modem|
|Transmit TV test image signals||my early radio setup|
A base station implementation of classic mobile networks. All these networks use analog voice transmission. The signaling is done by tones and/or FSK modulated digital messages. It started with the idea to make a base station for the German B-Netz, but more networks followed.
This project is pure software that requires a transmitter and a receiver connected to the sound card of a Linux PC. Alternatively (more suggested) you can use a full duplex SDR to even generate multiple channels at a time. A second sound card or ISDN card is used to route calls from and to the mobile phone.
Please go to project's hompage at http://osmocom-analog.eversberg.eu to download source code.
Thanx to Laf0rge, there is a mailing list: https://lists.osmocom.org/mailman/listinfo/osmocom-analog.