Chinese FXO/FXS cards. 4 ports card only cost around $55 USD.
http://openbsc.osmocom.org/trac/wiki/network_from_scratch
Rafael Micro RTL-SDR (R820T) 24-1766MHz 3.2MS/s 8bit No ~20
Elonics E4000 52 – 2200 MHz with a gap from 1100 MHz to 1250 MHz (varies)
has closed and is expensive
HackRF vs. BladeRF low cost tech similar to USRP
in use with gnu radio for signal control in time
http://www.rtl-sdr.com/tag/bladerf/
https://github.com/RangeNetworks/dev/wiki#running
https://github.com/Nuand/bladeRF/wiki/Getting-Started%3A-Linux#Redhatbased_distros_eg_Fedora_CentOS
http://www.yatebts.com/play_video.php
http://galaxyehacker.blogspot.it/2014/01/super-sim-sim-max.html
pySIM python application for USB SIM card reader / writer
priceangels.com
pandawill.com
dealextreme.com
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